Question

Refraction takes placed at a concave spherical boundary separating glass-air medium. For the image to be real, the object distance $({\mu }_g=3/2)$.

• A. Greater than three times the radius of curvature of the refracting surface
• B. Greater than two times the radius of curvature of the refracting surface
• C. Greater than the radius of curvature of the refracting surface
• D. Independent of the radius of curvature of the refracting surface

Answer 1

The correct option is B Greater than two times the radius of curvature of the refracting surface

The two slabs will shift the image a distance
$d=2(1-\frac{1}{\mu })t=2(1-\frac{1}{1.5})\left(1.5\right)=1.0cm$
Therefore, final image will be $1cm$ above point $P$.