Refraction of Light Test

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Refraction of Light Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

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 2
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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 3
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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 4
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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 5
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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.
Question 6
1 / -0

Which of the following statements is/are true about presbyopia?

A
Presbyopia is a condition that goes by the name of long sight.

B
It affects the older people.

C
It affects those whose eye muscles lose the ability to adjust the thickness of lens.

D
All of the above

Solution

Presbyopia is a condition associated with aging in which the eye exhibits a progressively diminished ability to focus on near objects.
Eye muscles looses the elasticity
So all the given statements are true.
Question 7
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What do you mean by centre of curvature?

A
The centre of curvature of each of the curved surfaces of a lens is the centre of an imaginary sphere of which the surface is a part.

B
The centre of curvature of each of the curved surfaces of a mirror is the centre of an imaginary sphere of which the surface is a part.

C
The centre of curvature of each of the curved surfaces of a lens is the centre of real sphere of which the surface is a part.

D
None of these

Solution

The centre of curvature of each of the curved surfaces of a lens is the centre of the imaginary sphere of which the surface is a part. A lens has two centres of curvature C₁ and C₂.
Question 8
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Which of the following statements is/are incorrect regarding rules of refraction?

A
A ray of light is not deviated if it passes through the pole of a lens.

B
A ray of light may deviate if it passes through the pole of a lens.

C
A ray of light passing through the focus of a convex lens or moving towards the focus of a concave lens emerges parallel to the principal axis.

D
All of the above

Solution

A ray of light will never deviate if it passes through the pole of a lens.
So, option (2) is not correct while options (1) and (3) are correct.
Question 9
1 / -0

The statement which is incorrect regarding image formation is

A
The image that can be formed on a screen is real image.

B
An image which cannot be formed on screen is virtual image.

C
The position and nature of the image depend mainly on the nature of lens and on the position of object relative to the lens.

D
All are correct

Solution

All the given statements are true, so none is incorrect.
Question 10
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A magnifying glass is an application of

A
Concave lens

B
Convex lens

C
Biconcave lens

D
Plano concave

Solution

A magnifying glass is a convex lens that is used to produce a magnified image of an object.
Question 11
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What do you mean by pole of a lens?

A
It is the point within the lens through which the principal axis passes is called the pole of the lens.

B
It is the point within the lens perpendicular to which the principal axis passes is called the pole of the lens

C
The distance from the centre to the focus is called pole

D
none of these

Solution

It is the point within the lens through which the principal axis passes is called the pole of the lens.This is more or less the centre of the lens.
Question 12
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Which lens is used by the projector used in a movie theatre?

A
Convex lenses

B
Concave lenses

C
Convexo concave

D
All of these

Solution

A projector in a movie theatre uses convex lenses to form images on the screen.
Question 13
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Which of the following statements is correct regarding an astronomical telescope?

A
There are two concave lens fitted at the ends of a long tube.

B
There is one convex and one concave lens at the ends of a long tube.

C
There are two convex lenses fitted at the ends of a long tube.

D
None of these

Solution

A telescope used to see heavenly bodies is called an astronomical telescope. It has two convex lenses at the ends of a long tube. The length of the tube is equal to the sum of the focal lengths of the two lenses.
Question 14
1 / -0

What kind of lens if formed in case of a binoculars used to view sports?

A
Diverging lens

B
Converging lens

C
Converging mirror

D
None of these

Solution

Binoculars or telescopes used to view sports events or distant objects use a diverging lens as a eyepiece. This helps to forma magnified image that is erect.
Question 15
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In case of a microscope,

A
the focal length of the objective is greater than that of the eyepiece

B
the focal length of the eyepiece is greater than that of the objective, but it is not very large

C
the lens which is brought closer to the object is called eyepiece

D
None of these

Solution

Option (2) is correct. In case of a microscope, the focal length of the eyepiece is greater than that of the objective, but it is not very large.
Question 16
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Which of the following statement is not correct?

A
light ray bends towards the normal while traveling form a rarer to a denser medium.

B
light ray bends away from The normal while traveling from a denser to a rarer medium

C
light ray bends only if it is incident at an angle to the normal.

D
All are correct.

Solution

All the given statements are correct. So 4^th option is correct answer.

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Refraction of Light Test - 5

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Refraction of Light Test - 5

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SHARING IS CARING

Question 1

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 2

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 3

Formation of image by a telescope

Formation of image by a mirror

Spectrum formation in case of a prism

None of these

Solution

Question 4

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 5

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

Question 6

Presbyopia is a condition that goes by the name of long sight.

It affects the older people.

It affects those whose eye muscles lose the ability to adjust the thickness of lens.

All of the above

Solution

Question 7

The centre of curvature of each of the curved surfaces of a lens is the centre of an imaginary sphere of which the surface is a part.

The centre of curvature of each of the curved surfaces of a mirror is the centre of an imaginary sphere of which the surface is a part.

The centre of curvature of each of the curved surfaces of a lens is the centre of real sphere of which the surface is a part.

None of these

Solution

Question 8

A ray of light is not deviated if it passes through the pole of a lens.

A ray of light may deviate if it passes through the pole of a lens.

A ray of light passing through the focus of a convex lens or moving towards the focus of a concave lens emerges parallel to the principal axis.

All of the above

Solution

Question 9

The image that can be formed on a screen is real image.

An image which cannot be formed on screen is virtual image.

The position and nature of the image depend mainly on the nature of lens and on the position of object relative to the lens.

All are correct

Solution

Question 10

Concave lens

Convex lens

Biconcave lens

Plano concave

Solution

Question 11

It is the point within the lens through which the principal axis passes is called the pole of the lens.

It is the point within the lens perpendicular to which the principal axis passes is called the pole of the lens

The distance from the centre to the focus is called pole

none of these

Solution

Question 12

Convex lenses

Concave lenses

Convexo concave

All of these

Solution