Question:

Two plane mirrors are inclined to each other at angle $ 60{}^\circ $ . Ray incident on first mirror parallel to the second mirror becomes parallel to first mirror after reflection. Angle of deviation is

Updated On: Jul 27, 2022

$ 30{}^\circ $
$ 60{}^\circ $
$ 90{}^\circ $
$ 120{}^\circ $

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The Correct Option is D

Solution and Explanation

The angle of deviation $ ={{180}^{o}}-{{60}^{o}} $ $ ={{120}^{o}} $

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Top Questions on Reflection Of Light By Spherical Mirrors

A light ray is incident on the surface of a sphere of refractive index n at an angle of incidence $\theta_0$. The ray partially refracts into the sphere with angle of refraction $\phi$ and then partly reflects from the back surface. The reflected ray then emerges out of the sphere after a partial refraction. The total angle of deviation of the emergent ray with respect to the incident ray is $a$. Match the quantities mentioned in List-I with their values in List-II and choose the correct option.

List-I		List-II
P	If $n = 2$ and $\alpha = 180°$, then all the possible values of $\theta_0$ will be	I	$30\degree$ or $0\degree$
Q	If $n = √3$ and $\alpha= 180°$, then all the possible values of $\theta_0$ will be	II	$60\degree$ or $0\degree$
R	If $n = √3$ and $\alpha= 180°$, then all the possible values of $\phi_0$ will be	III	$45\degree$ or $ 0\degree$
S	If $n = \sqrt2$ and $\theta_0 = 45°$, then all the possible values of $\alpha$ will be	IV	$150\degree$
			\[0\degree\]

JEE Advanced - 2024
Physics
Reflection Of Light By Spherical Mirrors

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Concepts Used:

Reflection of Light

When a light ray falls on any object, it is bounced back from the object. This process is known as the Reflection of light. The light reflected from the object falls into our eyes, making the object visible to us. All the things we see around us are because of reflection.

The reflection of light depends on the type of object. A polished or smooth surface reflects most of the light falling on it, while a rough surface absorbs some amount of light and reflects back the rest of the light. The direction of reflected rays depends upon the surface of the object.

List-I		List-II
P	If \(n = 2\) and \(\alpha = 180°\), then all the possible values of \(\theta_0\) will be	I	\(30\degree\) or \(0\degree\)
Q	If \(n = √3\) and \(\alpha= 180°\), then all the possible values of \(\theta_0\) will be	II	\(60\degree\) or \(0\degree\)
R	If \(n = √3\) and \(\alpha= 180°\), then all the possible values of \(\phi_0\) will be	III	\(45\degree\) or \( 0\degree\)
S	If \(n = \sqrt2\) and \(\theta_0 = 45°\), then all the possible values of \(\alpha\) will be	IV	\(150\degree\)
			\[0\degree\]