Refraction of Light Test

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Refraction of Light Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

What is incorrect regarding dispersion?

A
Separation of white colour into its constituent

B
Separation of white light into its constituent

C
Rainbows is an example of dispersion

D
None of these

Solution

option (1) is not correct as dispersion is the separation of white light into its constituent colour. So 1^st option is incorrect.
Question 2
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Which of the following is true regarding lenses?

A
A lens is a piece of transparent material bounded by curved surface.

B
Biconvex, concavo-convex and biconcave are converging lenses.

C
Convexo-concave, plano concave are examples of diverging lenses.

D
Both (1) and (3)

Solution

Options (1) and (3) are correct but option (2) is incorrect as biconvex, concavo-convex are converging lenses while biconcave lens is a diverging lens.
Question 3
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Which of the following statements are correct?

A
light rays coming from infinity, after passing through convex lens, meet at focus.

B
light rays coming form focus, after passing through concave lens, never meets.

C
When a ray of light passing through the pole, travels without angle deviation.

D
All of these.

Solution

All the given statements are true, so 4^th option is the answers.
Question 4
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What do you mean by principal axis?

A
The line joining the two centres of curvature

B
The line joining the two radius of curvature

C
Principal axis is line which joins the pole and focus of a lens

D
None of the above

Solution

The line joining the two centres of curvature of a lens is called the principal axis or optical axis of the lens.
Question 5
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An image formed by a concave lens is

A
real, erect and smaller than the object

B
virtual, erect and smaller than the object

C
virtual, invert and larger than the object

D
virtual, erect and larger than the object

Solution

An image formed by a concave lens is always virtual, erect and smaller than the object, irrespective of position of the object.
Question 6
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Which of the following statements is correct regarding defects of vision?

A
Common defects of vision, such as short sight or myopia and long sight or hypermetropia, can be corrected by mirrors.

B
In myopia, distant objects appear dizzy and it can be corrected by a convex lens.

C
In hypermetropia, objects that are close appear dizzy and it can be corrected by a concave lens.

D
None of these

Solution

All the given statements are incorrect:
(1) Common defects of vision can be corrected by using a lens, not a mirror.
(2) Myopia can be corrected by using concave lens.
(3) Hypermetropia can be corrected by using convex lens.

Therefore, 4^th option is the answer.
Question 7
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Which of the following statements is incorrect about microscopes and telescopes?

A
Both form magnified images of objects.

B
In both, the image formed by the eyepiece is magnified by objective.

C
In a microscope, both lenses have very short focal lengths.

D
In a telescope, the objective has a large focal length.

Solution

Option (2) is incorrect while all other options are true.
Question 8
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Which of the following processes involves dispersion?

A
Formation of image by a telescope

B
Formation of image by a mirror

C
Spectrum formation in case of a prism

D
None of these

Solution

First two options involve refraction of light. The 3^rd option involves dispersion of light in which white light forms a spectrum of its constituent colours.
Question 9
1 / -0

Which of the following is correct regarding myopia?

A
In myopia, objects at large distance does not look clear.

B
It can be overcome by using concave or diverging lens.

C
It can be overcome by using convex or diverging lens.

D
both (1) and (2)

Solution

Option (3) is incorrect as myopia cannot be overcome by using convex lens, but option (1) and (2) are true.
Question 10
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Which of the following reasons is responsible for the phenomenon of dispersion?

A
Refractive index of a medium is the same for lights of different colours.

B
Refractive index of a medium is slightly different for lights of different colours.

C
Refractive index of air is much higher for lights of different colours.

D
None of these

Solution

Refractive index of a medium is slightly different for lights of different colours.

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Re-Attempt Weekly Quiz Competition

Refraction of Light Test - 2

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Refraction of Light Test - 2

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SHARING IS CARING

Question 1

Separation of white colour into its constituent

Separation of white light into its constituent

Rainbows is an example of dispersion

None of these

Solution

Question 2

A lens is a piece of transparent material bounded by curved surface.

Biconvex, concavo-convex and biconcave are converging lenses.

Convexo-concave, plano concave are examples of diverging lenses.

Both (1) and (3)

Solution

Question 3

light rays coming from infinity, after passing through convex lens, meet at focus.

light rays coming form focus, after passing through concave lens, never meets.

When a ray of light passing through the pole, travels without angle deviation.

All of these.

Solution

Question 4

The line joining the two centres of curvature

The line joining the two radius of curvature

Principal axis is line which joins the pole and focus of a lens

None of the above

Solution

Question 5

real, erect and smaller than the object

virtual, erect and smaller than the object

virtual, invert and larger than the object

virtual, erect and larger than the object

Solution

Question 6

Common defects of vision, such as short sight or myopia and long sight or hypermetropia, can be corrected by mirrors.

In myopia, distant objects appear dizzy and it can be corrected by a convex lens.

In hypermetropia, objects that are close appear dizzy and it can be corrected by a concave lens.

None of these

Solution

Question 7

Both form magnified images of objects.

In both, the image formed by the eyepiece is magnified by objective.

In a microscope, both lenses have very short focal lengths.

In a telescope, the objective has a large focal length.

Solution

Question 8

Formation of image by a telescope

Formation of image by a mirror

Spectrum formation in case of a prism

None of these

Solution

Question 9

In myopia, objects at large distance does not look clear.

It can be overcome by using concave or diverging lens.

It can be overcome by using convex or diverging lens.

both (1) and (2)

Solution

Question 10

Refractive index of a medium is the same for lights of different colours.

Refractive index of a medium is slightly different for lights of different colours.

Refractive index of air is much higher for lights of different colours.

None of these

Solution

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