Question

A glass slab of thickness `3cm` and refractive index `3//2` is placed on ink mark on a piece of paper. For a person looking at the mark at a distance `5.0 cm` above it, the distance of the mark will appear to be
A. `3.0 cm`
B. `4.0 cm`
C. `4.5 cm`
D. `5.0 cm`

Answer 1

Correct Answer - B
The apparent depth of ink mark
`=("Real depth")/(mu)=(3)/(3//2)=2cm`
Thus person views mark at a distance `=2+2=4 cm.`