Light Reflection and Refraction Test

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Light Reflection and Refraction Test - 19

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Question 1
1 / -0

Which of the following statement is incorrect?
A. A ray of light passing from an optically rarer medium to an optically denser medium, bends away from the normal.
B. A ray of light passing from an optically denser medium to an optically rarer medium, bends away from the normal.
C. A ray of light passing from an optically rarer medium to an optically denser medium, bends toward the normal.
D. A ray light passing from an optically denser medium to an optically rarer medium, bends towards the normal.

A
A, B and D

B
A and D

C
A and C

D
B and C

Solution

A ray of light passing from an optically denser medium to an optically rarer medium, bends away from the normal, and a ray of light passing from an optically rarer medium to an optically denser medium, bends toward the normal.

Question 2

1 / -0

Match the following with the correct response:

(1) Highest refractive index	(A) Convex mirror
(2) Lowest refractive index	(B) Ice
(3) Head lights of a car	(C) Diamond
(4) Side rear view of a mirror	(D) Concave mirror

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

1-D, 2-A, 3-C, 4-B

1-B, 2-D, 3-A, 4-C

Solution

Diamond has a high refractive index of 2.42; ice has refractive index of 1.31. In the head lights of vehicles, the reflectors are concave in shape and the bulb is placed very near to the focus; the reflected light forms a powerful parallel beam and travels a large distance. Convex mirrors always form erect and diminished images and give a wide field of view; they are used as rear-view mirrors or wing mirrors. These enable the driver of the vehicle to see the traffic behind the vehicle to facilitate safe driving.

(1) Highest refractive index	(C) Diamond
(2) Lowest refractive index	(B) Ice
(3) Head-lights of a car	(D) Concave mirror
(4) Side rear view of a mirror	(A) Convex mirror

Question 3

1 / -0

Match the following with the correct response:

(1) Pole	(A) The midpoint of the reflecting surface of spherical mirror.
(2) Principal axis	(B) The radius of hollow sphere of which the reflecting surface forms a part.
(3) Radius of curvature	(C) The imaginary straight line joining the pole and the centre of curvature.
(4) Aperture	(D) The width of the mirror from which reflection can take place.

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

1-B, 2-D, 3-A, 4-C

1-D, 2-A, 3-C, 4-B

Solution

The reflecting surface of a spherical mirror forms a part of a hollow sphere. The reflecting surface has a circular outline. The radius of the sphere of which the reflecting surface of the mirror forms a part is called the radius of curvature of the mirror. The pole is the midpoint of the reflecting surface of a spherical mirror. The diameter of the reflecting surface of a spherical mirror is called its aperture.

(1) Pole	(A) The midpoint of the reflecting surface of spherical mirror.
(2) Principal axis	(C) The imaginary straight line joining the pole and the centre of curvature.
(3) Radius of curvature	(B) The radius of hollow sphere of which the reflecting surface forms a part.
(4) Aperture	(D) The width of the mirror from which reflection can take place.

Question 4

1 / -0

Match the following with the correct response:

(1) Concave mirror	(A) A spherical mirror whose reflecting surface is curved outwards
(2) Convex mirror	(B) Objects actually to the left appear to be on the right in the image
(3) Focal length	(C) The distance between the pole (P) and the focal point
(4) Lateral inversion	(D) A spherical mirror whose reflecting surface is curved inwards

1-C, 2-B, 3-D, 4-A

1-D, 2-A, 3-C, 4-B

1-B, 2-D, 3-A, 4-C

1-A, 2-C, 3-B, 4-D

Solution

A concave mirror is a spherical mirror whose reflecting surface is curved inwards. A convex mirror is a spherical mirror whose reflecting surface is curved outwards. Lateral inversion is the property of plane mirrors where objects actually to the left appear to be on the right in the image. Focal length is the distance between the pole (P) and the focal point (F) of a mirror/lens.

Question 5
1 / -0

Statement I - A real image is always inverted.
Statement II - A virtual image is always erect.

A
Statement II is true.

B
Statement I is true.

C
Both statements are correct.

D
Both are wrong.

Solution

Both the statements are correct. A real image is always inverted. A virtual image is always erect.
Question 6
1 / -0

When light enters from air to glass, which of the following changes:
A. Wavelength
B. Velocity
C. Frequency
D. Amplitude

A
B and C

B
A and D

C
A, B and D

D
A and C

Solution

When light enters from one medium into another, the frequency of light does not change. Speed, wavelength and amplitude may change depending upon the optical density of the two mediums.
Question 7
1 / -0

Which of the following statement is/are true?
A. The speed of all colours is same in air or vacuum.
B. The speed of all colours is different in denser media.
C. Speed of light in air is 3 × 10⁸ ms⁻¹
D. Refractive index has no unit.

A
All of these

B
A, B and C

C
A and B

D
B and D

Solution

All the given statements are correct. The speed of all colours is same in air or vacuum i.e. 3×10⁸ ms⁻¹. But the speed of all colours is different in a denser medium. Refractive index has no unit since it is a ratio. The absolute refractive index of a medium (n_m) is given by n_m=c/v where c is the speed of light in air, and v is the speed of light in the medium.
Question 8
1 / -0

According to New Cartesian Sign Convention for a convex lens:
A. Distance of the object is negative.
B. Distance of the real image is negative.
C. Distance of the virtual image is positive.
D. Focal length of the lens is positive.

A
A and B

B
All of these

C
A and D

D
A and C

Solution

According to New Cartesian Sign Convention for a convex lens, distance of the object from the pole is negative and the focal length of a convex lens is taken as positive.
Question 9
1 / -0

Characteristics of images formed by convex lens are:
A. Object at infinity; image is formed at focus F₂; real and inverted.
B. Object at 2F₁; image is formed at 2F₂; enlarged, virtual and erect.
C. Object beyond 2F₁; image is formed between F₂ and 2F₂; real and inverted.
D. Object at focus F₁; image is formed at infinity; virtual and erect.

A
C and D

B
A and C

C
A and B

D
A, B and C

Solution

An image formed by a convex lens is always real and inverted except when the object is between the optical centre and the focus F₁

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Light Reflection and Refraction Test - 19

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Question 1

A, B and D

A and D

A and C

B and C

Solution

Question 2

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

1-D, 2-A, 3-C, 4-B

1-B, 2-D, 3-A, 4-C

Solution

Question 3

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

1-B, 2-D, 3-A, 4-C

1-D, 2-A, 3-C, 4-B

Solution

Question 4

1-C, 2-B, 3-D, 4-A

1-D, 2-A, 3-C, 4-B

1-B, 2-D, 3-A, 4-C

1-A, 2-C, 3-B, 4-D

Solution

Question 5

Statement II is true.

Statement I is true.

Both statements are correct.

Both are wrong.

Solution

Question 6

B and C

A and D

A, B and D

A and C

Solution

Question 7

All of these

A, B and C

A and B

B and D

Solution

Question 8

A and B

All of these

A and D

A and C

Solution

Question 9

C and D

A and C

A and B

A, B and C

Solution

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