Light Test

Result

Light Test - 22

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Weekly Quiz Competition

Question 1
1 / -0

An image which can be only seen by the eye but cannot be taken on a screen is called a ________ .

A
virtual image

B
real image

C
artificial image

D
shadow

Solution

Virtual images cannot be taken on a screen as they are not formed by the actual intersection of light rays, but they can be seen by the eyes. Ex: Image seen in a plane mirror.
Question 2
1 / -0

If a lens diverges a parallel beam of light, the lens is -

A
Convex

B
Concave

C
Cylindrical

D
Parabolic

Solution

Concave lens diverges a parallel beam of light.
Answer-(B).
Question 3
1 / -0

When a divergent beam of light is incident on a plane mirror, the image formed is

A
Upright and real

B
Upright and virtual

C
Inverted and virtual

D
Inverted and real

Solution

A plane mirror always forms a virtual and erect image and that too of the same size but laterally inverted.
Question 4
1 / -0

Is it possible to photograph a virtual image?

A
Yes

B
No

C
Sometimes

D
Yes, provided that object is virtual

Solution

We can not photograph a virtual image because virtual images do not form with actual intersection of light rays. To photograph any object, it is important that its images should project on photographic film but virtual images can't be projected on the screen so they cannot capture.
Question 5
1 / -0

When sun rays are passed through a glass prism it gets

A
Deviated, but not dispersed

B
Deviated and dispersed

C
Dispersed, but not deviated

D
Neither deviated nor dispersed

Solution

Sun rays contain light rays with seven different wavelengths. When these different components pass through a prism, the refractive index of the prism material will be different for different wavelengths. This will cause the splitting of components which is known as dispersion.
On the other hand, deviation in the prism is a general characteristic of light. as there is a change in media the light rays will refract and bend.
So, option B is the correct one.
Question 6
1 / -0

What is the basic difference between a real image and a virtual image ?

A
Real image are the image that can be obtained on a screen whereas virtual image cannot be obtained on the screen

B
Virtual image can be obtained on a screen while real images cannot be obtained on a screen

C
Virtual images are formed only in refraction not in reflection while real image can be formed in both

D
Virtual images are formed only in reflection while real image are also only found in refraction

Solution

Real image are the images that can be obtained on screen while virtual images can't be obtained on a screen. This is basic difference between real and virtual image.
Question 7
1 / -0

Which mirror is used as a rear view mirror in vehicles?

A
Plain

B
Convex

C
Concave

D
Spherical
Question 8
1 / -0

When a beam of light comes from an object appears to meet at a point after reflection from a mirror, then the image formed is known as :

A
real image

B
virtual image

C
incident image

D
all of the above

Solution

According to definition, when a beam of light appears to meet at a point, after reflection, from a mirror then the image formed is a virtual image. It cannot be obtained on a screen.
Question 9
1 / -0

An image, that is not produced by light rays coming from the object, but is the result of our brain's interpretations, is called:

A
a real image

B
an imaginary image

C
a virtual image

D
nothing as no such image is ever produced

Solution

According to definition, when a beam of light appears to meet at a point after reflection from a mirror then the image formed is known as a virtual image. This image is merely our brain's interpretation as the reflected rays do not actually intersect to form the image.
Question 10
1 / -0

An object is placed at a distance of $$0.25m$$ in front of a plane mirror. The distance between the object and the image is:

A
$$0.5m$$

B
$$1m$$

C
$$0.25m$$

D
$$0.75m$$

Solution

For reflection from a plane mirror, distance between object and mirror $$=$$ distance between mirror and the image$$=0.25m$$
So, distance between object and image$$=$$ (distance between object and mirror) $$+$$ (distance between mirror and image) $$=(0.25+0.25)m=0.5m$$

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Re-Attempt Weekly Quiz Competition

Light Test - 22

Result

Light Test - 22

Score

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Rank

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SHARING IS CARING

Question 1

virtual image

real image

artificial image

shadow

Solution

Question 2

Convex

Concave

Cylindrical

Parabolic

Solution

Question 3

Upright and real

Upright and virtual

Inverted and virtual

Inverted and real

Solution

Question 4

Yes

No

Sometimes

Yes, provided that object is virtual

Solution

Question 5

Deviated, but not dispersed

Deviated and dispersed

Dispersed, but not deviated

Neither deviated nor dispersed

Solution

Question 6

Real image are the image that can be obtained on a screen whereas virtual image cannot be obtained on the screen

Virtual image can be obtained on a screen while real images cannot be obtained on a screen

Virtual images are formed only in refraction not in reflection while real image can be formed in both

Virtual images are formed only in reflection while real image are also only found in refraction

Solution

Question 7

Plain

Convex

Concave

Spherical

Question 8

real image

virtual image

incident image

all of the above

Solution

Question 9

a real image

an imaginary image

a virtual image

nothing as no such image is ever produced

Solution

Question 10

$$0.5m$$

$$1m$$

$$0.25m$$

$$0.75m$$

Solution

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