2007-04-28 02:47:02 · 4 answers · asked by rohit_gupta322 2 in Science & Mathematics ➔ Physics
You have written the equation wrongly. It is 1/v-1/u=1/f.
This equation is called " Gaussian form of lens equation".There are many ways of proving this equation. One way is by taking finite size of object. But the proving will require figures so its not possible to give complete proving here. I can give you hint and you can proceed on that.
Consider a convex lens and a finite object placed in front of it. Take two rays from object towards lens. One towards the optical center which passes undeviated and other parallel to principal axis which passes through principal focus. The two rays meet after refraction. When u will see figure you will find 4 triangle which. The opposite triangles will be similar. Taking similarity u can prove this equation. Just keep in mind the rules of coordinate geometry that we consider when considering rays.
2007-04-28 03:02:38 · answer #1 · answered by Abhinesh 4 · 0⤊ 0⤋
Your formula IS correct! Too complex to write a proof here, but have a look at the following:
http://www.palgrave.com/foundations/physics/docs/Further%20proofs.pdf
2007-04-28 12:07:25 · answer #2 · answered by JJ 7 · 0⤊ 0⤋
that's mirror formula...not lens.......
2007-04-28 09:51:37 · answer #3 · answered by anvesha 2 · 0⤊ 0⤋
what are v, u, f anyway?
2007-04-28 09:51:48 · answer #4 · answered by mohand20000 1 · 0⤊ 0⤋