A concave mirror of focal length `2 cm` is placed on a glass slab as shown in the figure. The image of point object O formed due to reflection at mirror and then refraction by the slab

Options

A. is virtual and at `2 cm` from pole of the concave mirror
B. is virtual and on the pole of mirror
C. is real and on the object itself
D. None of these

Answer

D

Explanation

Reflection from the concave mirror, `I_1`

`1/v+1/(-1)=1/(-2) rArr v=+2 cm`
Shift due to `slab =(1-1/n)t`
`=(1-2//3)(9 cm)`
`=3 cm`
Now, slab will make next image at a distance 3 cm
from `I_1` in the direction of ray of light, i.e. at O
itself but it is virtual, as the ray of light has crossed
the slab and we are making image behind the slab.