Question

An air bubble in a glass slab of refractive index 1.5 is 5 cm. view to 1 phase and 2 cm deep. you through the opposite face what is the thickness of the slab

Answer 1

Hi..

thickness of the slab = real depth from one face (d) + real depth from the opposite face (d')



now, we know that

refractive index = real depth / apparent depth



thus, for the one face

1.5 = d / 5cm

or

d = 7.5cm



and for the opposite face

1.5 = d'/2cm

or

d' = 3cm

, total thickness of the slab will be

T = d + d' = 3cm + 7.5cm

or

T =7.8 cm

Hope this helps u!!