Question

A glass prism deviates the red and blue rays through 10° and 12º respectively. A second prism of equal angle deviates them through 8° and 10° respectively. Their dispersive powers are in the ratio​

Answer 1

Answer:

Dispersive power, w=

δ

y

δ

v

−δ

r

δ

y

=

2

δ

v

+δ

r

w

1

=(12−10)×

(12+10)

2

=

22

4

w

2

=(10−8)×

(10+8)

2

=

18

4

w

1

:w

2

=9:11