• Light - Reflection and Refraction
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Light - Reflection and Refraction

Description: Light reflection and refraction
Number of Questions: 15
Created by:
Tags: Light reflection and refraction Reflection of Light Image Formation in Spherical Mirrors and their Ray Diagrams Mirrors Application of Mirror Formula
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What is the size of the image formed by a convex mirror when the object is placed at infinity and the image is formed at the focus behind the mirror?

  1. Enlarged

  2. Highly diminished

  3. Equal to the size of the object

  4. Diminished

  5. Highly enlarged

Show answer
Correct Option: B
Explanation:

At focus F behind the mirror, highly diminished, point sized image is formed.

Which of the following laws states that the incident ray, the normal to the surface at the point of incidence and the reflected ray, all lie in the same plane?

  1. Second law of reflection

  2. First law of refraction

  3. First law of reflection

  4. Second law of refraction

  5. Snell’s law

Show answer
Correct Option: C
Explanation:

First law: The incident ray, the normal to the surface at the point of incidence and the reflected ray, all lie in the same plane.

In which of the following mirrors is the reflecting surface curved outwards?

  1. Convex mirror

  2. Plane mirror

  3. Concave mirror

  4. Rear-view mirror

  5. One-way mirror

Show answer
Correct Option: A
Explanation:

In convex mirrors or diverging mirrors, the reflecting surface is curved outwards.

How is the factor of power of a lens denoted?

  1. P

  2. F

  3. D

  4. C

  5. O

Show answer
Correct Option: C
Explanation:

The SI unit of power of a lens is "dioptre", which is denoted by 'D'.

Which of the following denotes the correct relationship among object distance, image distance and focal length in a spherical mirror?

  1. 1/u + 1/v = 1/f

  2. m - (- v/u)

  3. 1/u - 1/v = 1/f

  4. m - (v/u)

  5. m + (v/u)

Show answer
Correct Option: A
Explanation:

Object distance (u), image distance (v) and focal length (f) of a spherical mirror are related as: 1/u + 1/v = 1/f

Which of the following options is not related to a spherical mirror?

  1. The centre of curvature lies behind the reflecting surface in the case of a convex mirror.

  2. In a spherical mirror of a small aperture, R = f.

  3. In a spherical mirror, pole is the centre of the mirror.

  4. The radius of curvature lies in front of a concave mirror.

  5. The focal length of a mirror is the distance between its pole and principal focus.

Show answer
Correct Option: B
Explanation:

For spherical mirrors of small aperture, R = 2f.

If the radius of curvature of a convex mirror is 24 cm, then calculate the focal length of the mirror.

  1. 0.083 cm

  2. 12 cm

  3. 0.041 cm

  4. 48 cm

  5. 96 cm

Show answer
Correct Option: B
Explanation:

Radius of curvature, R = 24 cm Radius of curvature = 2 × focal length (f) f = r/2 = 24/2 = 12 cm

The perpendicular distance between the direction of the incident ray and the emergent ray is known as

  1. lateral shift

  2. critical angle

  3. optical density

  4. magnification

  5. optical centre

Show answer
Correct Option: A
Explanation:

The perpendicular distance between the direction of the incident ray and the emergent ray is called “lateral shift’’.

What do you mean by 1 dioptre of power of a lens?

  1. The reciprocal of its focal length

  2. The separation between the pole and the centre of curvature

  3. The ratio of the height of image to the height of the object

  4. Imaginary straight line passing through the two centres of curvature

  5. The effective diameter of the circular outline of a spherical lens

Show answer
Correct Option: A
Explanation:

Power of a lens is defined as the reciprocal of its focal length. If P is the power of a lens of focal length f in metres, then p = 1/f.

Which of the following terms related to the reflecting surface of a spherical mirror forms a part of the sphere?

  1. Aperture

  2. Principal axis

  3. Focal length

  4. Centre of curvature

  5. Radius of curvature

Show answer
Correct Option: D
Explanation:

A lens, either a convex lens or a concave lens, has two spherical surfaces.

What is the speed of light in the glass whose refractive index is 1.20? (Given: Speed of light in vacuum = 3 × 108 m/s)

  1. 3.6 x 108 m/s

  2. 2 x 108 m/s

  3. 0.4 x 10-8 m/s

  4. 0.8 x 108 m/s

  5. 0.4 x 108 m/s

Show answer
Correct Option: B
Explanation:

Speed of light in glass = Speed of light in vacuum/refractive index of glass
= 3 × 108/1.20 = 2.5 x 108 m/s

Calculate the position of the image formed if a concave mirror produces a real image which is three times magnified of the object placed 20 cm infront of it.

    • 60 cm
    • 6.66 cm

  3. 60 cm

  4. 6.66 cm

  5. 0.15 cm

Show answer
Correct Option: C
Explanation:

Magnification produced by a spherical mirror is given by the relation,
m = hi/ho = - v/u Height of the object, ho = h

  • 3h/h = - v/u
    Object distance, u = - 20 cm
    v = - 60 cm

Calculate the power of a concave lens whose focal length is 4 m.

    • 0.25 D
    • 0.125 D
    • 0.5 D
    • 8 D

  5. 0.25 D

Show answer
Correct Option: A
Explanation:

The power of the given lens = 1/f = 1/- 4 = - 0.25 D

What will be the resultant deviation if two vertical plane mirrors are inclined at an angle of 40o with each other, where a ray is reflected first from one mirror and then from the other?

  1. 200o

  2. 350o

  3. 320o

  4. 280o

  5. 340o

Show answer
Correct Option: D
Explanation:

By using formula of deviation, we get   (360 - 2q) = (360 – 40 x 2) = 280o

Using the lens formula, calculate the image distance when an object is placed at a distance of 5 cm from a convex mirror of focal length 10 cm.

  1. 3 cm

  2. -10 cm

    • 0.1 cm

  4. 0.3 cm

  5. 15 cm

Show answer
Correct Option: A
Explanation:

Focal length of the convex mirror, f = + 10 cm Object distance, u = - 5 cm According to the lens formula, we get 1/v + 1/u = 1/f
1/v = 1/f - 1/u = 1/10 - 1/- 5 v = 3 cm

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