A mark placed on the surface of a sphere is viewed through glass from a position directly opposite. If the diameter of the sphere is `10 cm` and refractive index of glass is `1.5`, find the position of the image.

Options

A. `-20 cm`
B. `30 cm`
C. `40 cm`
D. `-10 cm`

Answer

A

Explanation

Here , `mu_(1) = 1, mu_(2) = 1.5, R = 5 cm, u = -10 cm`
`(1.5)/(10) + (1)/(v) = (1-1.5)/(-5) = 1/(10)` or `(1)/(v) = (1)/(10) - (3)/(20) = (-1 )/( 20) rArr v= - 20 cm`