Light from a point source in air falls on a convex curved surface of radius 20 cm and refractive index 1.5. If the source is located at 100 cm from the convex surface, the image will be formed at____ cm from the object.

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answer is 200.

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Detailed Solution

$\begin{aligned} \frac{μ_{2}}{v} - \frac{μ_{1}}{u} = \frac{μ_{2} - μ_{1}}{R} \\ \frac{1.5}{v} - \frac{1}{- 100} = \frac{1.5 - 1}{20} \end{aligned}$
$v = 100 cm$
Distance from object
$\begin{aligned} = 100 + 100 \\ = 200 cm \end{aligned}$

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