Question
Question: A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the l...
A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will:
A
Become zero
B
Become infinite
C
Become small, but non-zero
D
Remain uncharged
Answer
Become infinite
Explanation
Solution
: When refractive index of lens is equal to the refractive index of liquid, the lens begave like a plane surface with focal length infinity.