﻿ A ray of light incident normally on face AB of an isosceles prism travels as shown in fig. The least value of the refractive index the prism must have should be                                                                              : Kaysons Education

A Ray Of Light Incident Normally On Face AB of An Isosceles Prism Travels As Shown In Fig. The Least Value Of The Refractive Index The Prism Must Have Should Be

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Question

Solution

Correct option is

The ray is totally reflected at faces AC and CB. The angle of incidence at each face is at least ic = 45o. Therefore

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SIMILAR QUESTIONS

Q1

A convex glass lens (μg = 1.5) has a focal length of 8 cm when placed in air. What is the focal length of the lens when it is immersed in water (μw = 4/3)?

Q2

A plano-concave lens is made of glass of refractive index 1.5 and the radius of curvature of the curved face is 50 cm. The power of the lens is

Q3

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Q4

How will the image formed by a convex lens be affected if the central portion of the lens is wrapped in black paper, as shown in fig.

Q5

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Q6

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Q7

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Q8

An object, a convex lens of focal length 20 cm and a plane mirror are arranged as shown in fig. How far behind the mirror is the final image formed?

Q9

A small plane mirror is rotating at a constant frequency of n rotations per second. With what linear velocity (in ms–1) will a light spot move along a spherical screen of radius of curvature of R metres if the mirror is at the centre of curvature of the screen?

Q10

A beaker is filled with water to a height of 8.00 cm. The apparent depth of a needle fixed at the bottom of the beaker as measured by a travelling microscope is found to be 6.00 cm. If the height of water in the beaker is increased to 12.0 cm, by what distance would the microscope have to be moved to focus on the needle again?