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Question (31)

QN0036352

A person suffers from both myopia and hypermetropia. Which type of lens arrangement can commonly be used?

(A) Only a concave lens
(B) Only a convex lens
(C) Bifocal lens
(D) Plane glass

Correct Answer: C

Explanation:

A bifocal lens can contain both concave and convex portions for distant and near vision.

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Question (32)

QN0036353

In the common bifocal lens described in the chapter, the upper portion is generally:

(A) Convex and used for near vision
(B) Concave and used for distant vision
(C) Convex and used for distant vision
(D) Plane and used for near vision

Correct Answer: B

Explanation:

The upper concave portion facilitates distant vision.

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Question (33)

QN0036354

A triangular glass prism has two triangular bases and:

(A) Two rectangular lateral surfaces
(B) Three rectangular lateral surfaces
(C) Four rectangular lateral surfaces
(D) One rectangular lateral surface

Correct Answer: B

Explanation:

A triangular prism has two triangular bases and three rectangular lateral surfaces.

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Question (34)

QN0036355

When light travels from air into the glass of a prism, it generally bends:

(A) Away from the normal
(B) Towards the normal
(C) Along the surface
(D) Without any change in direction

Correct Answer: B

Explanation:

Light entering glass from air bends towards the normal.

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Question (35)

QN0036356

When light travels from glass to air at the second surface of a prism, it bends:

(A) Towards the normal
(B) Away from the normal
(C) Along the normal only
(D) It stops completely

Correct Answer: B

Explanation:

Light travelling from glass to air bends away from the normal.

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Question (36)

QN0036357

The angle between the two lateral faces of a prism is called:

(A) Angle of deviation
(B) Angle of incidence
(C) Angle of prism
(D) Angle of emergence

Correct Answer: C

Explanation:

The angle between the two lateral faces is called the angle of prism.

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Question (37)

QN0036358

If the incident ray and emergent ray of a prism are not parallel, the angle between the direction of the incident ray and emergent ray is called:

(A) Angle of prism
(B) Angle of deviation
(C) Angle of refraction
(D) Critical angle

Correct Answer: B

Explanation:

The angle through which the emergent ray deviates from the incident direction is the angle of deviation.

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Question (38)

QN0036359

A prism produces a spectrum from white light. Which sequence correctly represents the colours from violet to red?

(A) ROYGBIV
(B) VIBGYOR
(C) VIBGYRO
(D) BIVGYOR

Correct Answer: B

Explanation:

The colour sequence is Violet, Indigo, Blue, Green, Yellow, Orange and Red.

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Question (39)

QN0036360

A student observes that red light and violet light emerging from a prism travel in different directions. The main reason is that:

(A) Their speeds in vacuum are different
(B) Different colours bend through different angles
(C) Red light is reflected while violet is refracted
(D) Violet light has no wavelength

Correct Answer: B

Explanation:

Different colours undergo different amounts of refraction in a prism, producing dispersion.

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Question (40)

QN0036361

Newton placed a second identical prism in an inverted position after the first prism. What was observed?

(A) More colours were produced
(B) All colours disappeared permanently
(C) White light emerged from the second prism
(D) Only violet light emerged

Correct Answer: C

Explanation:

The second inverted prism recombined the dispersed colours into white light.

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Question (31)

A person suffers from both myopia and hypermetropia. Which type of lens arrangement can commonly be used?

Explanation:

Link:

Question (32)

In the common bifocal lens described in the chapter, the upper portion is generally:

Explanation:

Link:

Question (33)

A triangular glass prism has two triangular bases and:

Explanation:

Link:

Question (34)

When light travels from air into the glass of a prism, it generally bends:

Explanation:

Link:

Question (35)

When light travels from glass to air at the second surface of a prism, it bends:

Explanation:

Link:

Question (36)

The angle between the two lateral faces of a prism is called:

Explanation:

Link:

Question (37)

If the incident ray and emergent ray of a prism are not parallel, the angle between the direction of the incident ray and emergent ray is called:

Explanation:

Link:

Question (38)

A prism produces a spectrum from white light. Which sequence correctly represents the colours from violet to red?

Explanation:

Link:

Question (39)

A student observes that red light and violet light emerging from a prism travel in different directions. The main reason is that:

Explanation:

Link:

Question (40)

Newton placed a second identical prism in an inverted position after the first prism. What was observed?

Explanation:

Link:

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