Light Test

Result

Light Test - 16

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Weekly Quiz Competition

Question 1
1 / -0

When a convergent 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

Although a virtual object does not exist, a convergent beam of light refers to a point virtual object which is imagined to lie behind the mirror. This incident convergent light ray converges at this point. This virtual object has an image in front of the plane mirror of the same size and at the same distance in front of the plane mirror as the point of convergence behind the mirror. Since the point of intersection of the light, the ray is real. the image formed will be real. The ray diagram for this case has been attached with it.
Question 2
1 / -0

Which of the following can produce a virtual image for any position of the object?

A
Plane mirror

B
Concave mirror

C
Convex lens

D
All of the above

Solution
Question 3
1 / -0

The image formed by a plane mirror is _______ the object.

A
smaller than

B
bigger than

C
of the same size as

D
cannot be determined

Solution

The image formed by a plane mirror is of the same size as of the object as shown in the figure.
Question 4
1 / -0

We can see a non-luminous object when light :

A
emitted by the object falls on the eye

B
is reflected from the object towards our eye

C
completely passes through the object

D
gets completely absorbed by the object

Solution

We know that a non-luminous object is one that does not emit its own light, although it can still reflect light from other sources. So, we can see a non-luminous object, when light is reflected from the object towards our eyes.
Question 5
1 / -0

A ray of light is incident on a plane mirror at an angle of incidence $$30^{o}$$ to the normal. The ray after reflection is deviated with an angle of:

A
$$ 30^{0}$$

B
$$ 60^{0}$$

C
$$ 90^{0}$$

D
$$ 120^{0}$$

Solution

Since angle of incident =angle of reflection
Hence $$r=30^{0}$$
And here angle of deviation,
$$δ=180^{0}−(i+r)$$
$$=180^{0}−(30^{0}+30^{0})$$
$$=180^{0}−60^{0}$$
$$δ=120^{0}$$
Question 6
1 / -0

Which mirror should be used to obtain a parallel beam of light from a small lamp?

A
Plane mirror

B
Convex mirror

C
Concave mirror

D
None of the above

Solution

When the lamp is placed at the focus of the mirror then all the light after reflection becomes parallel to the axis of the mirror as shown in the figure.
Question 7
1 / -0

The mirror used in search lights is:

A
Concave

B
Convex

C
Plane

D
None of these

Solution

The mirror used in searchlights is concave such that when the light gets reflected from it goes parallel as shown in the figure. In search light, we need an intense parallel beam of light for searching objects. When an object is placed at the focus of a concave mirror, the reflected rays are parallel to each other and also parallel to the principal axis.
Question 8
1 / -0

........ images cannot be caught on a screen.

A
Real

B
Inverted

C
Virtual

D
Erect

Solution

Virtual images cannot be caught on a screen as they are not formed due to actual intersection of rays coming from the object.
Question 9
1 / -0

The mirror used in motor vehicles near the driver's seat is a

A
Concave mirror

B
Convex mirror

C
Plane mirror

D
None of theses

Solution

In motor vehicles, a convex mirror is attached near the driver's seat to give him a view of the traffic behind.
Question 10
1 / -0

Shaving mirrors are:

A
Convex mirrors

B
Concave mirrors

C
Plane mirrors

D
None of these

Solution

Shaving mirrors are concave mirrors as it forms magnified,erect and virtual image of object, clearly shown in the given figure.