A small black dot is made on the surface of a glass sphere `(mu=1.5)` and is viewed from the other side. If radius is 15 cm, find the position of the image.

Explanation

There is a block dot on the surface of glass sphere which act as an object. Glass sphere forms it virtual imate (I) as shown in Fig. We know that when the object liesin the denser medium then
`-(mu_(2))/u+(mu_(1))/v=(mu_(1)-mu_(2))/R`
Here `mu_(1)=1," "mu_(2)=1.5`
`u=-2xx15=-30cm`
`R=15cm`
From eq. (i)
`-1.5/(-30)+1/v`
`1/20+1/v=0.5/15`
`1/20+1/v=1/30`
`1/v=1/30-1/20=(2-3)/60=-1/60`
`v=-60 cm`