Refraction Through Lens Test

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Refraction Through Lens Test - 2

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Question 1
1 / -0

What kind of image is formed by a magnifying glass?

A
Virtual and magnified image

B
Virtual and diminished image

C
Real and diminished image

D
None of these
Question 2
1 / -0

A water tank appears shallower when it is viewed from top due to:

A
Rectilinear propagation of light

B
Reflection

C
Total internal reflection

D
Refraction

Solution

A water tank appears shallower when it is viewed from the top due to refraction. This phenomenon is because of the refraction of light. The lines of sight intersect at a higher position than where the actual rays originated. This causes the water to appear shallower than it really is. The depth that the water appears to be when viewed from above is known as the apparent depth.
Hence, the correct option is (D).
Question 3
1 / -0

Which of the following is not true regarding the focal length of a lens?

A
If a lens is placed in water, its focal length decreases.

B
If a lens is placed in water, its focal length increases.

C
Focal length of a lens depends upon the radii of curvature of two surfaces of lens.

D
Both (2) and (3)
Question 4
1 / -0

What is true about lens and image formed by a telescope?

A
The objective lens of a telescope is a convex lens, which forms real and erect image of the object.

B
The objective lens of a telescope is a convex lens, which forms real and inverted image of the object.

C
The objective lens of a telescope is a convex lens, which forms virtual and inverted image of the object.

D
None of these
Question 5
1 / -0

What do you mean by optical centre of a lens?

A
It is a point on the principal axis of a lens such that a ray of light passing through this point is perpendicular to its direction of incidence.

B
It is centre of the principal axis of a lens such that a ray of light passing through this point is parallel to its direction of incidence.

C
It is a point on the radius of sphere of which the lens surface is a part.

D
None of these
Question 6
1 / -0

Some portion of convex lens is wrapped in black paper as shown in the figure. Which of the following is correct for this?

A
No image will be formed.

B
Central portion of the image will be missing.

C
There will be two images formed.

D
None of these
Question 7
1 / -0

Which of the following is not correct about the usage of lenses?

A
A person suffering from hypermetropia wears convex lens.

B
A person suffering from myopia wears concave lens.

C
Some people having both short and long sighted disorder use bifocal lenses.

D
All are correct.
Question 8
1 / -0

The rainbow formation is due to:

A
Absorption of sunlight by water droplets

B
Diffusion of sunlight through water droplets

C
Ionisation of water droplets

D
Refraction and reflection of sunlight by water droplets

Solution

Rainbows are formed when light from the sun is scattered by water droplets (e.g. raindrops or fog) through a process called refraction. Refraction occurs when the light from the sun changes direction when passing through a medium denser than air, such as a raindrop.
Sunlight hitting a water droplet (sphere) in the atmosphere will be refracted on the surface of the droplet, and enters the droplet. When the refraction process occurs, the light breaks up into seven colors inside the water droplet and is next reflected at the other surface of the droplet after traveling inside it.
Hence, the correct option is (D).
Question 9
1 / -0

If object is put at a distance of 10 cm from the focus of a convex lens of 20 cm, what will be the distance of the real image formed by the lens?

A
40 cm

B
45 cm

C
30 cm

D
20 cm
Question 10
1 / -0

What do you mean by principal axis?

A
It is the line joining the centre of curvature of two surfaces of a mirror.

B
It is the line joining the centre of radius of curvature of two surfaces of a mirror.

C
It is the line joining the centre of radius of curvature of two surfaces of the lens.

D
None of the above
Question 11
1 / -0

Which of the following statements is true?

A
A convex lens has a divergent action, and a concave lens has a convergent action.

B
A ray of light parallel to the principal axis of a lens passes undeviated after refraction.

C
A ray of light incident at the optical centre of the lens passes undeviated after refraction.

D
A concave lens forms a magnified or diminished image depending on the distance of the object from it.
Question 12
1 / -0

What will happen to the focal length of a lens if half part of it is covered with some coating?

A
Focal length will become half.

B
Focal length will become 4 times.

C
Focal length will become 2 times.

D
Focal length will remain the same.
Question 13
1 / -0

Which of the following can form the virtual and small image of an object?

A
Concave mirror

B
Convex lens

C
Concave lens

D
Either (1) or (2)
Question 14
1 / -0

What is the nature of an image formed by a concave lens?

A
Virtual, inverted and diminished

B
Virtual, erect and diminished

C
Virtual, inverted and enlarged

D
Real, erect and diminished
Question 15
1 / -0

In case of a convex lens of focal length C, what is the minimum distance between the position of the object and the point where image formation takes place?

A
4C

B
8C

C
9C

D
2C

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Refraction Through Lens Test - 2

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Refraction Through Lens Test - 2

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SHARING IS CARING

Question 1

Virtual and magnified image

Virtual and diminished image

Real and diminished image

None of these

Question 2

Rectilinear propagation of light

Reflection

Total internal reflection

Refraction

Solution

Question 3

If a lens is placed in water, its focal length decreases.

If a lens is placed in water, its focal length increases.

Focal length of a lens depends upon the radii of curvature of two surfaces of lens.

Both (2) and (3)

Question 4

The objective lens of a telescope is a convex lens, which forms real and erect image of the object.

The objective lens of a telescope is a convex lens, which forms real and inverted image of the object.

The objective lens of a telescope is a convex lens, which forms virtual and inverted image of the object.

None of these

Question 5

It is a point on the principal axis of a lens such that a ray of light passing through this point is perpendicular to its direction of incidence.

It is centre of the principal axis of a lens such that a ray of light passing through this point is parallel to its direction of incidence.

It is a point on the radius of sphere of which the lens surface is a part.

None of these

Question 6

No image will be formed.

Central portion of the image will be missing.

There will be two images formed.

None of these

Question 7

A person suffering from hypermetropia wears convex lens.

A person suffering from myopia wears concave lens.

Some people having both short and long sighted disorder use bifocal lenses.

All are correct.

Question 8

Absorption of sunlight by water droplets

Diffusion of sunlight through water droplets

Ionisation of water droplets

Refraction and reflection of sunlight by water droplets

Solution

Question 9

40 cm

45 cm

30 cm

20 cm

Question 10

It is the line joining the centre of curvature of two surfaces of a mirror.

It is the line joining the centre of radius of curvature of two surfaces of a mirror.

It is the line joining the centre of radius of curvature of two surfaces of the lens.

None of the above

Question 11

A convex lens has a divergent action, and a concave lens has a convergent action.

A ray of light parallel to the principal axis of a lens passes undeviated after refraction.

A ray of light incident at the optical centre of the lens passes undeviated after refraction.

A concave lens forms a magnified or diminished image depending on the distance of the object from it.

Question 12

Focal length will become half.

Focal length will become 4 times.

Focal length will become 2 times.

Focal length will remain the same.

Question 13

Concave mirror

Convex lens

Concave lens

Either (1) or (2)

Question 14

Virtual, inverted and diminished

Virtual, erect and diminished

Virtual, inverted and enlarged

Real, erect and diminished