Question

A printed page of is kept pressed by a glass cube (n=1.5) of edge 9 cm. By what amount will the printed letters appear to be shifted when viewed from the top?

Answer 1

This is the concept of Real depth and apparent depth.

The formula for the same is given by,

Refractive index=Real depth/Apparent depth

Here, the letters printed on the printed page is at 9 cm, which signifies the real depth.

Refractive index is given =1.5,

we get
1.5=9/apparent depth

apparent depth=9/1.5
=6cm

At 6 cm from the top surface of cube will the letters appear when seen from above of the cube.