Light Test

Result

Light Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

A virtual image is one which:

A
Can be taken on a screen

B
Cannot be taken on a screen

C
Sometimes can be and sometimes cannot be taken on a screen

D
Is formed only by a concave mirror

Solution

A virtual image is an image formed when the outgoing rays from a point on an object always diverge. The image appears to be located at the point of apparent divergence. Because the rays never really converge, a virtual image cannot be projected onto a screen. In diagrams of optical systems, virtual rays are conventionally represented by dotted lines. Virtual images are located by tracing the real rays that emerge from an optical device backward to a perceived point of origin.
Question 2
1 / -0

The concave mirrors are used in:

A
Reflecting telescope

B
Magic-lanterns

C
Cinema projectors

D
All of these

Solution

A reflecting telescope uses concave mirrors as they produce images similar to the images produced by convex lenses i.e. upright and smaller than the object.

The magic lantern used a concave mirror in back of a light source to direct as much of the light as possible through a small rectangular sheet of glass.

Concave mirrors project a beam of light outward, which is required in a cinema projector.
Question 3
1 / -0

The image formed by a plane mirror is always ______ inverted.

A
Laterally

B
Virtually

C
Really

D
None of these

Solution

The image formed by a plane mirror is always laterally inverted it is due to the direction that light follows when it strikes the plane mirror.
If an object is placed in front of a plane mirror, then the right side of the object appears to be the left side of the image, and the left side of the object appears to be the right side of its image. This phenomenon is called lateral inversion.
Question 4
1 / -0

The mirror used by dentists to concentrate light on the tooth to be examined is a:

A
Concave mirror

B
Normal triangular mirror

C
Convex mirror

D
Plane mirror

Solution

When the object is between pole and focus, a concave mirror produce erect, enlarged image. That is why concave mirror is used by dentists in such a way that the tooth to be examined is within focal length of mirror and forms magnified image which helps doctor too examine tooth easily.
Question 5
1 / -0

........ images can be caught on a screen.

A
Real

B
Inverted

C
Virtual

D
Erect

Solution

Real images can be caught on screen.
It can be seen that the image is formed by actual light rays and thus can form a visible image on a screen placed at the position of the image.
Question 6
1 / -0

Which of the following mirror is used to concentrate light on a given spot?

A
Concave mirror

B
Convex mirror

C
Plane mirror

D
None of these

Solution

A concave mirror is also called a converging mirror. When parallel rays of light fall on a concave mirror, they all converge at a point, called the focus point, after being reflected by the mirror.
So, a concave mirror is used to concentrate light on a given spot.
Question 7
1 / -0

The light emanating from a torchlight is

A
Convergent

B
Divergent

C
Parallel

D
Irregular

Solution

A torch has a bulb working on a battery. A bulb spreads the light rays in all directions. Thus, rays from a torchlight are divergent.
Question 8
1 / -0

Rectilinear propagation of light is :

A
Property of travelling in curved lines

B
Property of travelling in straight lines

C
Ability to bend around obstacles

D
Displaying the phenomenon of diffraction

Solution

Rectilinear propagation of light is the tendency of light to travel in a straight line.
Question 9
1 / -0

Light shows:

A
Curvilinear propagation

B
Rectilinear propagation

C
Random propagation

D
None of the above

Solution

Light shows Rectilinear propagation.
Rectilinear Propagation of Light is the tendency of light to travel in a straight line.
Question 10
1 / -0

Consider the following statements:
(a) Real image is always inverted
(b) Virtual image is always erect
(c) Image formed by a concave lens is always real and inverted.
Which of the above statement(s) is/are correct?

A
Only (a)

B
Only (b)

C
(a) and (b)

D
All of the above

Solution

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Re-Attempt Weekly Quiz Competition

Light Test - 17

Result

Light Test - 17

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SHARING IS CARING

Question 1

Can be taken on a screen

Cannot be taken on a screen

Sometimes can be and sometimes cannot be taken on a screen

Is formed only by a concave mirror

Solution

Question 2

Reflecting telescope

Magic-lanterns

Cinema projectors

All of these

Solution

Question 3

Laterally

Virtually

Really

None of these

Solution

Question 4

Concave mirror

Normal triangular mirror

Convex mirror

Plane mirror

Solution

Question 5

Real

Inverted

Virtual

Erect

Solution

Question 6

Concave mirror

Convex mirror

Plane mirror

None of these

Solution

Question 7

Convergent

Divergent

Parallel

Irregular

Solution

Question 8

Property of travelling in curved lines

Property of travelling in straight lines

Ability to bend around obstacles

Displaying the phenomenon of diffraction

Solution

Question 9

Curvilinear propagation

Rectilinear propagation

Random propagation

None of the above

Solution

Question 10

Only (a)

Only (b)

(a) and (b)

All of the above

Solution

User

Question Analysis

My Perfomance

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