A plane mirror is made of glass slab (`mu_(g)=1.5`) 2.5 cm thick and silvered on back. A point object is placed 5 cm in front of the unsilvered face of the mirror. What will be the position of final image ?

Options

A. 9cm
B. 11cm
C. 12cm
D. 13cm

Answer

d.

Explanation

A thick glass mirro produces a number of images.
There is an apparent shift of actual silvered surface toward the unsilvered face.
Effective distance of the reflecting surface from unsilvered
face `=(d)/(mu)=(3)/(3//2)cm=2cm`
Distance of the point object from effective reflecting surface
`=9cm+2cm=11cm`
Distance of image from the point object
`=11cm+11cm=22cm`
Distance of image from unsilevered face
`=(22-9)cm =13cm`