First slide

Ray optics

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 zero
B

become infinite
C

reduce
D

increase

Solution

$μ = μ_{m} f \to \inf i n i t e$ $\frac{1}{f} = (\frac{μ}{μ_{m}} - 1) (\frac{1}{R_{1}} - \frac{1}{R_{2}})$

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