Question

16. Describe how would you determine the apparent
thickness of a block of glass.​

Answer 1

Answer:

A man places a rectangular glass slab of thickness 9 cm on a newspaper. On the top of glass slab he places a glass beaker of negligible wall thickness containing water up to a height of 6 cm. If refractive index of glass is 1.5 and refractive index of water is (4/3), what is the apparent depth of the newspaper?

Answer 2

Answer:

Solution

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We use

μ=

Apparent depth

Real depth/thickness of theobject

Due to refraction at two boundaries, the apparent depth of the newspaper will be

Apparent depth=

μ

glass

Thickness of the glass

+

μ

water

Thickness of the water

=

1.5

9

+

1.3

6

=6+4.6

=10.6 cm

Apparent depth of newspaper is 10.6 cm.

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