Question

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Fibre optic periscopes are uses
as endoscopes to
view internal organs
the body.
25.
Figure 3.11
Submarine with Periscope
lies
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3.8
Refraction of Light
We know that when a light ray falls on
a polished surface placed in air, it is reflected
into the air itself. When it falls on a transparent
material, it is not reflected completely, but a part
of it is reflected, a part of it is absorbed and most
of the light passes through it. Through air, light
travels with a speed of 3 x 108 m s', but it cannot
travel with the same speed in water or glass,
because, optically denser medium such as water
and glass offer some resistance to the light rays.
So, light rays travelling from
medium like air into a denser medium like
glass or water are deviated from their straight
line path. This bending of light about the
normal, at the point of incidence; as it passes
from one transparent medium to another is
called refraction of light.
a
rarer
When a light ray travels from the rare
medium into the denser medium, it bend
towards the normal and when it travels fro​

Answer 1

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