Question

if angle of incidence increases angle of deviation decreases, but after a certain value of angle of incident, the angle of deviation increases. what is that specific value of angle of incidence called does these angles same for light of all colour?​

Answer 1

Answer:

We see that in the beginning as angle of incidence

i

is increased, the corresponding angle of deviation

d

decreases. At some angle of incidence, the angle of deviation becomes minimum and then after if we continue to increase the angle of incidence, the angle of deviation again increases. But, we can not have value of

i

greater than 90

90

o

.

Also,

+=+

i

+

e

=

A

+

d

The value of

i

and

e

changes between 0 and 90 degree. A is constant for given prism. Therefore,

d

will remain finite, and we can decrease or increase

i

to get

d

smaller or greater than minimum

d

up to certain finite range.