There are of course superachromat lenses made out of special fluorite glass, that can focus both infrared and visible light simultaneously, so you don't need an active focus adjustment on the camera. Trouble is they cost thousands of dollars. The other way to solve the same issue is to have a small sensor with essentially a pinhole for a lens, like a camera phone sensor, but then the sensitivity will be poor and the image turns out noisy due to the amplification.
Then there's also the issue that a mirror gives you the benefit of binocular depth vision, whereas a display in the dash doesn't. That's why rear view cams often have the diagonal lines superimposed to give some reference of depth. Little wipers and demister for the camera? I doubt that cameras will displace rear-view mirrors until cars are self-driving. A self-driving car would rely on cameras, such as the degree camera that Google has mounted on the roof.
It has also added hugely to weight. My first Mustang in weighed lbs. A new one of the same kind is lbs. Problem was the very low sun angle plus frost-sparkle had dazzled the camera, left the display a wash of white FWIW, while shopping for previous car, I sat in a show-room's nice hatch-back. To my astonishment, neither its mirrors nor windows let me see an enormous SUV displayed a few feet off the rear-wing. I made the sales-man sit in, look around. He confirmed my findings, got out white with shock. The longer 'estate' version had a neat window instead of a too-fat pillar. It lacked the hatch-back's huge blind-spot, so that's what I got Incidentally, such 'blind angles' leave a car vulnerable at 'constant convergence' junctions; if your 'spidey sense' doesn't spot the danger so you look about, you're road-kill For lack of better metaphor, it's simply an attempt to re-invent the subsequently - more expensive wheel It's just another thing to go wrong.
Think of all the things that have to go right for a camera to work properly. Mirrors are basically simple. As long as humans continue to drive cars, I will continue to advocate the use of mirrors. As for how to set up these cameras, yes, they could have lens cleaner systems. But I wouldn't bet my life on a reservoir of washer fluid. I would like to see periscope instead of camera. Bring the view from rear to the dashboard using mirrors.
May be weird thought but I am armchair inventor: A digital camera-viewfinder systems however adds a noticeable processing lag in the tens and hundreds of milliseconds Riiiight If you rely on tens of milliseconds for your reaction which is way below your reaction time you're sunk, anyhow.
It's in the responsibility ofa driver to keep his vehicle operational. And fluid reservoir sensors aren't exactly rocket tech. If you do your regular check ups you need never worry at all about any fluids except gas. Look at the MTBF of such a system. It's like parking systems which also come with cameras nowadays.
If the MTBF is longer than the lifetime of the car - so what? The main point was that the view you can see with your eyes towards the front is moving at a different time from the view to the back. In other words, when the car turns slightly, the same motion is reflected in the rear view a hundred milliseconds later, and that is massively disorienting - as if the entire world was wobbling around you. It's completely different to a drone pilot who is basically ignoring everything that goes on around his viewfinder, whereas the car driver is also looking forwards with their peripherial vision while they're looking at the mirror or the monitor.
That might look like there's an opening to merge into, when in reality there isn't. Display lag is at worst in the region of 70ms https: The MTBF is typically defined as the time until half the units have failed. The MTBF has to be -considerably- longer than the lifetime of the car because there will be a number of duds well before that. For example, the MTBF of a typical laptop is around 6 years based on individual component specifications to 50, hours.
It's pretty hard to make a digital camera that would not break in 20 years, which is the typical useful life of a car - especially when it has to operate in such a demanding envinronment full of vibration and moisture, cold and hot. A color LCD monitor doesn't stand a chance. Display lag is at worst in the region of 70ms Which is in the range I specified. It's due to the fact that the display has to have at least double buffering to stop the picture from tearing. Basically, if you want to make any movements, other than straight ahead, you should check your rearview mirror before doing it, so that you can make the change safely.
When changing lanes, you use a combination of your rearview mirror and your side mirror to see if where you are moving is clear, as well as turning around to see if there is anyone in your blind spot. The combination of all of these checks will make switching lanes safer.
Use your rearview mirror when backing up. The rear-view mirror is especially important when you are moving your vehicle in reverse. The mirror will help you to know the course is clear and that you can move without coming into contact with another car, person, or property. When moving in reverse, it is also important to rely on things other than the rear-view mirror.
Check your side mirrors and turn around and look behind the car with your own eyes in order to assess the situation. After all, it is always better to be safe than sorry. Look at your rearview mirror when navigating heavy or irregular traffic.
The rearview mirror can give you a lot of good information when trying to get through a stressful and busy driving situation. For example, look in your mirror to assess whether moving in reverse will help you get out of a tight space or just lock you into a even more tenuous position. Look before you make a quick stop, if you can. Before you brake hard, take a quick second to assess whether any cars are too close to your rear end to stop. If that is the case, consider adjusting your lane or your braking speed if you can. If you can't, then knowing a car behind you may hit you will give you a second to brace for an impact.
If you are looking in your rearview mirror at regular intervals already, you may already have a good idea if a vehicle is close behind you.
End of the road for rearview mirror?
This will help you to make a quick judgement about the following distance and if a vehicle will have time to stop before hitting you. Being good at judging the following distance of vehicles behind you should help you adjust your braking measures in order to prevent a rear-end collision from happening. This is the case for the passenger side-view mirror but not the center rear-view window. There should even be a warning on your side-view mirror as a reminder of this fact. Not Helpful 0 Helpful 3.
It can, but it's main purpose is to see what happens behind your car. When you adjust the mirror, you should focus on your back window and not the interior of your car. Not Helpful 0 Helpful 1. How long should it take to look in the rear view mirror and then back to the normal driving view? A glance of seconds is sufficient. Perhaps an injection of more advanced material in natural sciences in lower-level education would help improving the backgrounds of us readers, but, well, that would take quite some times.
A minor problem I encountered in this book is Goldberg's treatment of "ancient" scientists. Well, they were not correct in their interpretations, but I wish the audience could appreciate more their legacies and we should. There are some nice and fun anecdotes about scientists from the Enlightenment onwards Newton for sure, then Galileo for instance , but history-lovers, beware! Sciences, for instance, were not so much differentiated from alchemies in earlyth, the church was not so against the new progress in science, such as the introduction of the heliocentric system, as it was against Galileo's condescending and self-centered behavior.
But of course, these things do not interfere so much with the content and purpose of this book - they are just some sidenotes, I just want to give a few warnings View all 5 comments. Jun 25, David Everling rated it really liked it. Where did the big bang happen? How Hidden Symmetries Shape Reality is an easy read covering some less easy theoretical concepts. Relativity general and special , sub-atomic particle physics, the directionality of time itself, all are among the topics illustrated by author Dave Goldberg. Goldberg, an astrophysicist by trade and Where did the big bang happen?
Goldberg, an astrophysicist by trade and frequently asked physicist on io9. One that Goldberg utilizes in his introduction as a succinct justification of the book's premise comes from Nobel laureate Phil Anderson: Building from the more intuitive forms of symmetry e. Of course the symmetries don't explain everything. But they aren't supposed to either. In fact much of the book has author Dave Goldberg pointing out just how wrong we often are when it comes to understanding this material intuitively.
The theme of symmetries gives us a model with which to gain a better working understanding of the universe. And yet, in the end what we have is still a model and not the universe. Werner Heisenberg said it best: Because the universe expands like a stretching rubber sheet, not an explosion. If you don't like writing with frequent asides consider yourself warned. References to the bottom of the page aside, the notes themselves are often chuckle-worthy.
Jul 15, Tommy Carlson rated it really liked it. There's a problem with physics non-fiction. The problem is that it rarely hits the sweet spot for me. I have a year of college physics under my belt, along with an interested layperson's perspective. Actual technical papers are far beyond me. Yet most popular physics books are well below my knowledge level. I want something beyond Gee, aren't black holes awesome! A Universe From Nothing hit the mark pretty well. I think it's a good sign that The Universe in the Rearview Mirror does as well. No, I didn't understand all of it, but I did understand most and got the gist of the rest.
The book is also packed with awesome illustrations is a great old-timey style. So I was able to easily take the images and use them as screensavers for my Nook. Once I stripped the DRM, which you should always do. The downside to all the illustrations is that they bogged down my eReader.
Page turns were slower, dramatically so in illustration-heavy chapters. The book is also packed with geek culture asides. Maxwell's Demon is drawn as a Cylon, for example. While entertaining and enriching, this does lead to a problem, at least in an eBook. The asides are presented as end notes. So, each time I want to see one, I have to tap on a wee little asterisk.
Then I have to remember to tap on the Done button at the top of the screen instead of mistakenly hitting the Page Back button.
Because that'll take me back a page to the prior end note, not back to the text. And then I can't hit the Done button because changing the page makes that button go away. And then I have to go to the Table of Contents, go to the correct chapter, then page forward to where I left off, which is a pain with this book, as the page turns are slow, as mentioned above. And that's a lot to bother with just to read a one sentence aside.
Just put those suckers in parens, dammit! Note that it also inflates the page numbering. I don't mean that as a criticism, as the book is a good length. But those last hundred pages? One end note per page. View all 3 comments. Mar 05, Jason , etc. You hear talk of bosons and quantum particles, but efforts to satisfy your curiosity have proven fruitless. At some point, say in a crowded bar outside of a major university, your ear may have plucked from the air part of a conversation between two very hairy people about how glorious and miraculous and beautiful are the mathematical symmetries governing the universe.
Suddenly, some piddling disagreement about a minor theoretical point bursts into flames.
Mothers are pillorie You hear talk of bosons and quantum particles, but efforts to satisfy your curiosity have proven fruitless. As a kid watching Star Trek, you may have wondered: Would there be any 'me' left? If so, could one gather the parts of 'me' still available in order to reconstruct 'ME'? Is the story of Humpty Dumpty an allegory for the dangers of teleportation?
The point is that most people curious about the universe are really interested in physics, whether they realize it or not. Physics, however, can be intimidating. Especially the equations in quantum mechanics, it's perfectly normal to multiply a letter by an upside-down triangle. Books like these by authors like this are valuable because they communicate difficult concepts in ways that anyone can understand, all while keeping the reader engaged, entertained, and awake. The talent required to effectively communicate difficult scientific concepts is a rare thing. Carl Sagan had it and Neil deGrasse Tyson currently has it.
Goldberg is impressive, is what I'm saying. The book's first sentence: Quick a place to start as any I can imagine. Sep 19, Phil Scovis rated it really liked it. One of the better physics books, it's easy to read and follow. It doesn't hurt that there's all sorts of nerd humor and in-jokes sprinkled throughout. The first law of Thermodynamics: You do NOT talk about thermodynamics! The importance of symmetry in physical science has been neglected in popular science writing.
Feynman's lectures focused on it, as did Asimov's book on the discovery of the neutrino. But I can't think of another more recent book that does it so well. Thus, it may be surprising One of the better physics books, it's easy to read and follow. Thus, it may be surprising to learn that fundamental physics has become simpler, rather than more complex over time, owing to the deep and beautiful symmetries of our latest theories.
I was delighted to hear the story of Emmy Noether. I had heard of "Noether's Theorem", one of the most important results for understanding our universe. But I always pictured "Noether" as some dude in a white coat and horn-rimmed glasses. Not a Victorian-age woman. About halfway, the book bogs down in tedious details of fundamental particles, and loses the momentum and unity that the first chapters build. The explanations become glib, and even the jokes start to fall off too. Jun 12, Gergely rated it liked it Shelves: Its jokes get a bit tiresome after a while, but in general they add an interesting tone.
Does try to tackle a lot, and generally gets there, though at the expense of clarity, I feel: I've ended up with a lot more occasions of "I wish he'd written a few more sentences about this", than how many times it felt too much of explanation. It's not a bad read for broadening one's horizon, t Its jokes get a bit tiresome after a while, but in general they add an interesting tone.
Jupiter in the Rearview Mirror | Mission Juno
It's not a bad read for broadening one's horizon, though probably as part of a reading list, rather than a single book on this topic. Jan 20, Steve rated it it was amazing. I've read several books on physics and not only did this one explore alot of ground that others didn't but it was hands down the funniest and the only one that made me laugh out loud the whole time I was reading it. I felt I understood it very well but started reading it a second time three weeks later just because it was that entertaining. If you have some understanding of the subject or want to this is a must read. Nov 18, pumpkinchips rated it it was amazing.
I personally loved this book. The viewpoints on everything were really interesting and the writer's style of writing was understandable but not lame. I definitely enjoyed the points about the paradox we live in; the fact that matter shouldn't even be here fascinated me. I would recommend this book to anyone who likes understanding and exploring the inner workings of the universe as a whole.