Question

An air bubble in a glass slab (u=1.5) is 5 cm deep when viewed from one face and 2 cm deep when viewed from the other face . The slab thickness is

Answer 1

Answer:

x

1

be the real distance of the bubble

∴μ

g

=

Apparent depth

Real depth

=

6

x

1

⇒1.5=

6

x

1

x

1

=1.5×6=9cm.

When viewed from other side, μ

g

=

4

x

2

⇒1.5=

4

x

2

⇒x

2

=6cm=1.5×4

∴ Total thickness of slab =x

1

+x

2

=9+6=15cm