A plano-convex lens having radius of curvature of first surface 2 cm exhibits focal length of f₁ in air. Anoth…

Question

A plano-convex lens having radius of curvature of first surface $2 \, \text{cm}$ exhibits focal length of $f_1$ in air. Another plano-convex lens with first surface radius of curvature $3 \, \text{cm}$ has focal length of $f_2$ when it is immersed in a liquid of refractive index $1.2$ . If both the lenses are made of the same glass of refractive index $1.5$ , the ratio of $f_1$ and $f_2$ will be:

A
$3 : 5$
B
$1 : 3$
C
$1 : 2$
D
$2 : 3$

Accepted Answer

B. $$1 : 3$$

Answer

A. $$3 : 5$$

Answer

C. $$1 : 2$$

Answer

D. $$2 : 3$$

Answer & step-by-step solution

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