Question

A point object is placed at the center of a glass sphere of radius 6 cm and refractive index 1.5. The distance of virtual image from the surface is :

• A. 6 cm
• B. 4 cm
• C. 12 cm
• D. 9 cm

Answer 1

The correct option is A 6 cm

Given, $u=-R$ ; $R=-R$

From the formula for curved surface , $\frac{{\mu }_2}{v}-\frac{{\mu }_1}{u}=\frac{{\mu }_2-{\mu }_1}{R}$

$\frac{1}{v}-\frac{3}{2R}=\frac{1}{2R}$

$v=-R=-6cm$

option $A$ is correct