First slide

The lens

Question

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

Moderate

A

Become infinite
B

Become small, but non–zero
C

Remain unchanged
D

Become zero

Solution

$\frac{1}{f} = (\frac{μ_{g}}{μ_{l}} - 1) (\frac{1}{R_{1}} - \frac{1}{R_{2}}) If μ_{g} = μ_{l} then f = \infty$

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