A concave-convex lens of refractive index... | Ray Optics

JEE MAIN 2025

08-04-2025 S2

Question

A concave-convex lens of refractive index 1.5 and the radii of curvature of its surfaces are 30 cm and 20 cm , respectively. The concave surface is upwards and is filled with a liquid of refractive index 1.3. The focal length of the liquid-glass combination will be

Select the correct option:

$\frac{700}{11} \mathrm{~cm}$

$\frac{600}{11} \mathrm{~cm}$

$\frac{800}{11} \mathrm{~cm}$

$\frac{500}{11} \mathrm{~cm}$

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution