Home
Class 12
PHYSICS
Two identical thin isosceles prisms of r...

Two identical thin isosceles prisms of refracting angle A and refractive index `mu` are placed with their bases touching each other and this system can collectively act as a crude converging lens. A parallel beam of light is incident on this system as shown in Figure. Find the focal length of this so called converging lens.

A

`b/((mu-1)theta)`

B

`b/(2(mu-1)theta)`

C

`(2b)/((mu-1)theta)`

D

`(btheta)/((mu-1)theta)`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Similar Questions

Explore conceptually related problems

Two isosceles prism of prism angle A and refractive index mu are placed with their bases touching each other. This system can act as a crude converging lens. The focal length of the lens for A=10^(@),mu=1.5 and a ray of light incident on a prims at a height of 1 cm from its base, is approximately.

Two isosceles prism of prism angle A and refractive index mu are placed with their bases touching each other. This system can act as a crude converging lens. The focal length of the lens for A=10^(@),mu=1.5 and a ray of light incident on a prims at a height of 1 cm from its base, is approximately.

Two converging lenses of focal lengths f_(1)=10cm and f_(2)=20cm are placed at some separation. A parallel beam of light is incident on first lens. Then,

There is a equilateral prism of refractive index 3 on which a light ray is incident normally on one face as shown in the figure. Find the length of the path traveled by the light ray inside the prism.

Refractive index of the material of concave lens is mu . The lens is immersed inb a medium of refractive index mu_(1)(mu_(1)gtmu) . A parallel beam of light is incident on the lens. Draw a diagram to show the path of emergent rays.

In the figure, light is incident on a thin lens as shown. The radius of curvature for both the surfaces is R. Determine the focal length of this system.

An isosceles prism of angle 120degree has a refractive index 1.44. Two parallel monochromatic rays enter the prism parallel to each other in air as shown. The rays emerge from the opposite faces

A double convex lens, lens made of a material of refractive index mu_(1) , is placed inside two liquids or refractive indices mu_(2) and mu_(3) , as shown. mu_(2)gtmu_(1)gtmu_(3) . A wide, parallel beam of light is incident on the lens from the left. The lens will give rise to

A right angled triangular prism of refractive index mu_(1) is kept floating on a liquid (surface) having refractive index mu_(2) . The condition such tat light incident normally passes through base of prism as shown in figure.

The focal length of an equi-concave lens is 3/4 times of radius of curvature of its surfaces. Find the refractive index of the material of lens. Under what condition will this lens behave as a converging lens?