Light from a point source in air falls on a convex spherical glass surface `(mu = 1.5 and R = 20 cm)`. Calculate position of the image when the light source is at `1m` from the glass surface.

Explanation

Here, `mu_2 = 1.5, mu_1 = 1 , R = 20 cm` ,
`u = -100 cm, v = ?`
As light goes from air (rarer medium) to glass (denser medium), therefore,
`-(mu_1)/(u)+(mu_2)/(v)=(mu_2 - mu_1)/( R)`
`-(1)/(100)+(1.5)/(v)=(1.5 - 1)/(20)=(1)/(40)`
`(3)/(2 v)=(1)/(40)-(1)/(100)=(5 - 2)/(200)=(3)/(200) = 100 cm`
`:.` The image is formed at a distance of `100 cm` from the glass surface, in the direction of incident light.