Refraction Through Lens Test

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Refraction Through Lens Test - 1

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Weekly Quiz Competition

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

What do you mean by centre of curvature?

A
Centre of the circle whose part is lens surface

B
Centre of the sphere whose part is lens surface

C
Diameter of the sphere whose part is lens surface

D
None of these
Question 3
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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

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 7
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 8
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 9
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 10
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 11
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 12
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 13
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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 - 1

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Question 1

Virtual and magnified image

Virtual and diminished image

Real and diminished image

None of these

Question 2

Centre of the circle whose part is lens surface

Centre of the sphere whose part is lens surface

Diameter of the sphere whose part is lens surface

None of these

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

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 7

40 cm

45 cm

30 cm

20 cm

Question 8

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 9

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 10

Focal length will become half.

Focal length will become 4 times.

Focal length will become 2 times.

Focal length will remain the same.

Question 11

Concave mirror

Convex lens

Concave lens

Either (1) or (2)

Question 12

Virtual, inverted and diminished

Virtual, erect and diminished

Virtual, inverted and enlarged

Real, erect and diminished

Question 13

4C

8C

9C

2C

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