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2006-10-09 04:45:24 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Physics
It would depend on the difference in refractive index between the water and the lens. If the lens had exactly the same R.I. as water it would cease to function as a lens as no refraction would occur.
It would follow, then, that as the R.I. of the lens increased relative to the water the focal length would decrease.
2006-10-09 06:12:47 · answer #1 · answered by black sheep 2 · 0⤊ 0⤋
The effective focal length of a typical convex lens (e.g., refractive index n=1.5) will get longer when it is under water (n=1.33) as compared to being in air (n=1).
You can estimate how much longer by looking up the Lensmaker's Equation, or the simpler Thin Lens Formula.
2006-10-10 02:25:58 · answer #2 · answered by or_try_this 3 · 0⤊ 0⤋
THE FOCAL LENGHT WILL REMAIN THE SAME
2006-10-09 11:49:01 · answer #3 · answered by HEMNATH 2 · 0⤊ 0⤋
It becomes distorted from the water.
2006-10-09 11:56:10 · answer #4 · answered by deno 3 · 0⤊ 0⤋