Question

Light from a point source in air falls on a convex spherical glass surface (n = 1.5, radius of curvature = 20 cm). The distance of light source from the glass surface is 100 cm. At What position is the image formed?

Answer 1

n₁ = 1; n₂ = 1.5 

u = 100cm ; R = + 20 cm 

(R is + Ve for a convex refracting surfce)

As \(\frac{1}{2}\) = \(\frac{1}{2}\) 

Thus the image is formed at a distance of 100 cm from the glass surface in the direction of incident light.