Question

20.Medium A is optically denser than medium B. When a light ray travels from medium A to B


a)It bends towards the normal

b)It bends away from the normal

c)It does not bend

d)Sometimes it bends towards the normal and sometimes it bends away from the normal.

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Answer 1

Answer:

D sometimes it bends toward the normal

Answer 2

Answer:

b)It bends away from the normal

Explanation:

When a ray of light travels from optically denser medium to optically rarer medium, it always bends away from the normal.

According to Snell's Law:

n

1

n

2

=

sinr

sini

For optically denser medium, refractive index n

1

is greater than that of the rarer medium n

2

. Thus, the angle of refraction has to be greater than angle of incidence i.e. it bends away from the normal.