A concave-convex lens of refractive index 1.5 and the radii of curvature of its surfaces are 30 cm and 20 cm,…

Question

A concave-convex lens of refractive index $1.5$ and the radii of curvature of its surfaces are $30 \, \text{cm}$ and $20 \, \text{cm}$ , 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:

A
$\frac{800}{11} \, \text{cm}$
B
$\frac{500}{11} \, \text{cm}$
C
$\frac{700}{11} \, \text{cm}$
D
$\frac{600}{11} \, \text{cm}$

Accepted Answer

D. $$\frac{600}{11} \, 	ext{cm}$$

Answer

A. $$\frac{800}{11} \, 	ext{cm}$$

Answer

B. $$\frac{500}{11} \, 	ext{cm}$$

Answer

C. $$\frac{700}{11} \, 	ext{cm}$$

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