A ray of light wavelength λ 0 and frequency v 0 enters a glass slab of refractive index μ from air. Then,

Δ λ = λ 0 1 μ - 1 and Δ v ⁡ = 0

Its wavelength increases, frequency decreases

Its wavelength increases, frequency remains same

Match the corresponding entries of column 1 with column 2. [Where m is the magnification produced by the mirror] Column 1 Column 2 (A) m = - 2 (a) Convex mirror (B) m = - 1 2 (b) Concave mirror (C) m = + 2 (c) Real image (D) m = + 1 2 (d) Virtual image

A → b and c; B → b and c; C → b and d; D → a and d

A → a and c; B → a and d; C → a and b; D → c and d

A → a and d; B → b and c; C → b and d; D → b and c

A → c and d; B → b and d; C → b and c; D → a and d

HARD

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Three plane mirrors form an equilateral triangle with each side of length $L$ . There is a small hole at a distance $l > 0$ from one of the corners as shown in the figure. A ray of light is passed through the hole at an angle $θ$ and can only come out through the same hole. The cross section of the mirror configuration and the ray of light lie on the same plane.

Which of the following statement(s) is(are) correct?

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Important Questions on Ray Optics

EASY

Physics>Optics>Ray Optics>Reflection and Refraction at Plane and Spherical Surfaces

Distinguish between the inverted image and laterally inverted image.

EASY

Physics>Optics>Ray Optics>Reflection and Refraction at Plane and Spherical Surfaces

If the object is at a distance of $3 cm$ from the plane mirror, then the distance of the image will be:

EASY

Physics>Optics>Ray Optics>Reflection and Refraction at Plane and Spherical Surfaces

State any three characteristics of image formed by a plane mirror.

MEDIUM

Physics>Optics>Ray Optics>Reflection and Refraction at Plane and Spherical Surfaces

A man of height

H

stands at a distance

D

from a mirror fixed on the wall. His eye level is at the same height as the top edge of the mirror. What must be the minimum length

L

of the mirror so that he can see his entire body in the mirror? You can assume that the eye-level is the same as the top of his head.

EASY

Physics>Optics>Ray Optics>Reflection and Refraction at Plane and Spherical Surfaces

What is the minimum size of mirror required for a

6 ft

tall person to be able to see a full length image?

MEDIUM

Physics>Optics>Ray Optics>Reflection and Refraction at Plane and Spherical Surfaces

Vimal combs her hair is front of a plane mirror. Write two characteristics of her image.

EASY

Physics>Optics>Ray Optics>Reflection and Refraction at Plane and Spherical Surfaces

How can you identify a plane, concave and convex mirror by observing image formation?

HARD

Physics>Optics>Ray Optics>Reflection and Refraction at Plane and Spherical Surfaces

A transparent slab of thickness

d

has a refractive index

n (z)

that increases with

z

. Here

z

is the vertical distance inside the slab, measured from the top. The slab is placed between two media with uniform refractive indices

n_{1} and n_{2} (> n_{1}),

as shown in the figure. A ray of light is incident with angle

θ_{i}

from medium 1 and emerges in medium 2 with refraction angle

θ_{f}

with a lateral displacement

l

. Which of the following statement(s) is (are) true?
Question Image

MEDIUM

Physics>Optics>Ray Optics>Reflection and Refraction at Plane and Spherical Surfaces

Two plane mirrors

M_{1}

and

M_{2}

are at right angle to each other shown. A point source

P

is placed at

a

and

2 a

meter away from

M_{1}

and

M_{2}

respectively. The shortest distance between the images thus formed is : (Take

\sqrt{5} = 2.3

)

EASY

Physics>Optics>Ray Optics>Reflection and Refraction at Plane and Spherical Surfaces

Image formed by a plane mirror is erect, virtual and _____.

MEDIUM

Physics>Optics>Ray Optics>Reflection and Refraction at Plane and Spherical Surfaces

A ray of light wavelength

λ_{0}

and frequency v₀ enters a glass slab of refractive index

μ

from air. Then,

EASY

Physics>Optics>Ray Optics>Reflection and Refraction at Plane and Spherical Surfaces

Two plane mirrors are inclined to each other at an angle of

60 ° .

A point object is placed in between them. The total number of images produced by both the mirrors is

MEDIUM

Physics>Optics>Ray Optics>Reflection and Refraction at Plane and Spherical Surfaces

Match the corresponding entries of column 1 with column 2. [Where m is the magnification produced by the mirror]

	Column 1		Column 2
(A)	$m = - 2$	(a)	Convex mirror
(B)	$m = - \frac{1}{2}$	(b)	Concave mirror
(C)	$m = + 2$	(c)	Real image
(D)	$m = + \frac{1}{2}$	(d)	Virtual image

EASY

Physics>Optics>Ray Optics>Reflection and Refraction at Plane and Spherical Surfaces

State two characteristics of image formed in a plane mirror.

HARD

Physics>Optics>Ray Optics>Reflection and Refraction at Plane and Spherical Surfaces

A plano-convex lens is made of a material of refractive index n. When a small object is placed 30 cm away in front of the curved surface of the lens, an image of double the size of the object is produced. Due to reflection from the convex surface of the lens, another faint image is observed at a distance of 10 cm away from the lens. Which of the following statement(s) is (are) true?

MEDIUM

Physics>Optics>Ray Optics>Reflection and Refraction at Plane and Spherical Surfaces

A light wave is incident normally on a glass slab of refractive index

1.5 .

4 %

of light gets reflected and the amplitude of the electric field of the incident light is

30 \frac{V}{m},

then the amplitude of the electric field for the wave propagating in the glass medium will be:

HARD

Physics>Optics>Ray Optics>Reflection and Refraction at Plane and Spherical Surfaces

The eye can be regarded as a single refracting surface. The radius of curvature of this surface is equal to that of the cornea

(7 .8 mm)

. This surface separates two media of refractive indices

1

and

1.34

. Calculate the distance from the refracting surface at which a parallel beam of light will come to focus.

EASY

Physics>Optics>Ray Optics>Reflection and Refraction at Plane and Spherical Surfaces

Write any three differences between plane and convex mirror.

EASY

Physics>Optics>Ray Optics>Reflection and Refraction at Plane and Spherical Surfaces

A girl is standing

7 m

from a plane mirror. The distance of the girl from her image in the mirror is

HARD

Physics>Optics>Ray Optics>Reflection and Refraction at Plane and Spherical Surfaces

Two plane mirrors are kept on a horizontal table making an angle $θ$ with each other as shown schematically in the figure. The angle $θ$ is such that any ray of light reflected after striking both the mirrors return parallel to its incident path. For this to happen, the value of $θ$ should be

Question Image

Important Questions on Ray Optics

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