Home
Class 12
PHYSICS
The focal lengths of a thin convex lens ...

The focal lengths of a thin convex lens for red and blue colour are 100.5 cm and 99.5 cm. The dispersive power of the lens is :

A

0.01

B

0.02

C

1.005

D

0.995.

Text Solution

Verified by Experts

Promotional Banner

Similar Questions

Explore conceptually related problems

The focal length of a lens for red and violet colours are 16.4 cm and 16 cm. What is its dispersive power ?

When a parallel beam of light passes through a convex lens , red, yellow and blue colours are focussed at 19.5, 20.0 and 20.5 cm. The dispersive power of the material of prism is :

The focal length of convex lens is 50 cm, its power is

A parallel beam of white light falls on a convex lens. Images of blue, yellow and red light are formed on other side of the lens at a distance 20 cm, 20.5 cm and 21.4 cm respectively. The dispersive power of the material of the lens will be

A thin prism of refracting angle 5^(@) deviates the red and blue rays by 9.9^(@) and 10.1^(@) . The dispersive power of the material is

For which colour the focal length of a convex lens is more ?

A thin convex lens of focal length 10 cm and a thin concave lens of focal length 20 cm are in contact. The combination acts as :

To produce an achromatic combination a convex lens of local length 42 cm and dispersive power 0.14 is placed in contact with a concave lens of dispersive power 0.21. The focal length of the concave lens is