﻿ Two plane mirrors are inclined to each other such that a ray of light incident on the first mirror and parallel to the second is reflected from the second mirror parallel to the first mirror the angle between the two mirrors is    : Kaysons Education

# Two Plane Mirrors Are Inclined To Each Other Such That A Ray Of Light Incident On The First Mirror And Parallel To The Second Is Reflected From The Second Mirror Parallel To The First Mirror The Angle Between The Two Mirrors Is

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## Question

### Solution

Correct option is

60o

Refer to fig.

Let θ bet he angle between the two mirrors OM1 and OM2. The incident ray AB is parallel to mirror OM2 and strikes the mirror OM1 at an angle of incidence equal to α. It is reflected along BC; the angle of reflection being α. Form fig. We have

Similarly for reflection at mirror OM2, we have

Now in triangle OBC; 3θ = 180o. Therefore

#### SIMILAR QUESTIONS

Q1

To print a photograph from a negative, the time of exposure to light from a lamp placed 60  cm away is 2.5 s. What exposure time is required if the lamp is placed 1.2 m away?

Q2

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Q3

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Q4

Which mirror should be used to obtain a parallel beam of light from a small lamp?

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Choose the only wrong statement from the following.

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Q7

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Q8

Two plane mirrors are inclined to each other at an angle of 70o. A ray is incident on one mirror at an angle θ. The ray reflected from this mirror falls on the second mirror from where it is reflected parallel to the first mirror. What is the value of θ?

Q9

One end of a strip of a plane mirror 2.5 cm in length, is fixed. The other end rests on the top of a small vertical rod. A beam of light is reflected from the mirror and forms a spot on a screen 3 m away from the mirror. If the top of the rod is moved upwards 0.1 mm, what will be the movement of the spot?

Q10

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