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NEET 2003 (AIPMT) · Spherical Surfaces & Thin Lenses

Spherical Surfaces & Thin Lenses question from NEET 2003 (AIPMT)

Q108NEET 2003 · AIPMTEasy

Spherical Surfaces & Thin Lenses

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

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Answer: (b)

$\frac{1}{f} = \left(\frac{\mu_l}{\mu_m} - 1\right)\left(\frac{1}{R_1} - \frac{1}{R_2}\right)$
With $\mu_m = \mu_l$ the bracket is zero, so $f = \infty$ .
So the answer is (b) become infinite.

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