Question 161 of 295

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

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Answer: 200

$\dfrac{{\mu }_{2}}{v}-\dfrac{{\mu }_{1}}{u}=\dfrac{{\mu }_{2}-{\mu }_{1}}{R}$
$\Rightarrow \dfrac{1.5}{v}-\dfrac{1}{-100}=\dfrac{1.5-1}{20}$
$\Rightarrow v=100cm$
Distance from object
$=100+100$
$=200cm$