Question

An air bubble in a glass slab with refractive index 1.5 is 5cm deep

Answer 1

As we learnt in

Relation between real depth and apparent depth -

 

- wherein

 = Refractive index of medium of incident.

 = Refractive index of medium of refraction.

d = distance of object.

 = apparent  depth

 

 

Apparent depth=5cm  from one side 

 Real depth=1.5x5=7.5 cm 

apparent depth=3cm from other side 

 Real depth from other side =3x1.5cm=4.5

 Thickness of slab=7.5cm+4.5cm=12cm