Refraction of Light Test

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Refraction of Light Test - 3

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Weekly Quiz Competition

Question 1
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 2
1 / -0

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 3
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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 4
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 5
1 / -0

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 6
1 / -0

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 7
1 / -0

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 8
1 / -0

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 9
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 10
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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

In case of a microscope, the focal length of the eyepiece is greater than that of the objective, but it is not very large.

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Re-Attempt Weekly Quiz Competition

Refraction of Light Test - 3

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Refraction of Light Test - 3

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SHARING IS CARING

Question 1

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 2

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 3

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 4

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 5

Concave lens

Convex lens

Biconcave lens

Plano concave

Solution

Question 6

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 7

Convex lenses

Concave lenses

Convexo concave

All of these

Solution

Question 8

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

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

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

None of these

Solution

Question 9

Diverging lens

Converging lens

Converging mirror

None of these

Solution

Question 10

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

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

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

None of these

Solution

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