Question

observed that
(1) When a ray of light travels from a rarer
to a denser medium (say, from air to
water or from air to glass), it bends
towards the normal as shown in
nd concave)
ors - Focus,
vature, radius of
Fig. 5.1.
ms of spherical
Normal
Air
rrors where real
stituent colours.
Water
(or glass)
Initial direction
Apparent direction
NT MEDIA
ad that light
or glass. The
Fig. 5.1 A ray travelling from rarer to denser
medium bends towards the normal​

Answer 1

Answer:

When light rays travel from air into glass or from air into water, it bends towards normal. This is because the speed of light rays decrease while travelling from air into glass or water. Case 2: When light rays travel from optically denser medium to rarer medium then they bend away from the normal.

Answer 2

Answer:

Laws of refraction;-

The incident ray,the refracted ray and the normal to the refracting surface at the point of incidence lie in the same plane.

For a given pair of media and for a given colour of light the ration between the sine of angle of incidence to the sine of refraction is a constant.This constant is known as refractive index of the second medium with respect to the first medium.

When a ray of light passes through a glass slab, ∠i,∠r and the normal all lie in the same plane.

When a ray of light passes from one medium to another, here from air to glass or glass to air, the ratio

sinr

sini

=constant.

solution

Explanation:

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