Light Test

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Light Test - 16

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements is true?

A
Normal is always perpendicular to the mirror

B
Incident ray is always on the left side of the normal

C
Reflected ray is always on the right side of the normal

D
Both B and C are true

Solution

Normal is an imaginary line drawn perpendicular to the mirror. Incident and reflected rays may be in any side of the normal.
Question 2
1 / -0

You are able to see in shaded areas, such as under a tree, because light has undergone:

A
refraction

B
incident bending

C
a change in speed

D
diffused reflection

Solution

Because of diffuse reflection, we are able to see shaded areas under trees. In reflection, parallel rays of light, after striking a rough and curved surface, get reflected irregularly.
Hence Option D
Question 3
1 / -0

Irregular reflection occurs due to:

A
failure of laws of reflection

B
irregularity in reflecting surface

C
irregular light

D
all of these

Solution

Irregular reflection occurs when parallel rays of light are incident on an irregular or rough surface and after reflection emerge in different directions. This type of reflection occurs due to irregularity of the reflecting surface.
Regular reflections occur from smooth or polished surfaces.
Question 4
1 / -0

The angle between the incident ray and the reflecting surface is known as:

A
glancing angle of incidence

B
angle of incidence

C
glancing angle of reflection

D
angle of reflection

Solution

According to the definition, the angle between the incident ray and the reflecting surface is known as glancing angle of incidence. Sum of glancing angle of incidence and the angle of incidence is $$90^0$$.
Question 5
1 / -0

Angle which the normal ray makes with the mirror is equal to:

A
$$\displaystyle { 30 }^{ \circ}$$

B
$$\displaystyle { 45 }^{ \circ }$$

C
$$\displaystyle { 90 }^{ \circ }$$

D
$$\displaystyle { 180 }^{ \circ }$$

Solution

The perpendicular drawn to the surface of the mirror at the point of incidence is known as a normal ray. So, the angle made by the ray with the mirror is equal to $$\displaystyle { 90 }^{ \circ }$$.
Question 6
1 / -0

The ray which bounces off the surface of the mirror when the incident ray strikes the mirror is known as ________. The point at which incident ray meets the mirror is called the _________.

A
normal ray, point of reflection

B
reflected ray, point of refraction

C
reflected ray, point of incidence

D
diffracted ray, point of diffraction

Solution

According to definition of reflected ray and point of incidence, the ray which bounces off the surface of the mirror when the incident ray strikes the mirror is known as the reflected ray. The point at which incident ray meets the mirror is called the point of incidence.
Question 7
1 / -0

When all the parallel rays reflected from a mirror are parallel, the reflection is known as:

A
regular reflection

B
irregular reflection

C
diffused reflection

D
none of these

Solution

In regular reflection, parallel rays of light, after reflection, reflects parallelly.
Question 8
1 / -0

Regular reflection takes place when light is incident on:

A
A rough curved surface

B
A highly polished plane surface

C
Both $$A$$ and $$B$$

D
None of these

Solution

When parallel rays of light are incident on a highly polished plane surface, after reflection, the rays emerge parallel as well. This type of reflection is called regular reflection. For example, a plane mirror.
Question 9
1 / -0

The term 'multiple images' is used:

A
When a single object forms multiple images in one single mirror

B
When a single object forms multiple images in different mirrors

C
When a single mirror form multiple images of multiple objects

D
All of the above

Solution

Two or more mirrors inclined to each other give multiple images.
The term 'multiple images' is used when a single object forms multiple images in different mirrors.
Question 10
1 / -0

Mark the WRONG statement:

When two plane mirrors are placed parallel to each other:

A
no image will be formed

B
infinite number of images will be formed

C
brightness of the images will decrease

D
images are erect

Solution

When two plane mirrors are placed parallel to each other infinite number of erect images will be formed. And brightness will also decrease.
Hence, Statement in option A is wrong.

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Re-Attempt Weekly Quiz Competition

Light Test - 16

Result

Light Test - 16

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SHARING IS CARING

Question 1

Normal is always perpendicular to the mirror

Incident ray is always on the left side of the normal

Reflected ray is always on the right side of the normal

Both B and C are true

Solution

Question 2

refraction

incident bending

a change in speed

diffused reflection

Solution

Question 3

failure of laws of reflection

irregularity in reflecting surface

irregular light

all of these

Solution

Question 4

glancing angle of incidence

angle of incidence

glancing angle of reflection

angle of reflection

Solution

Question 5

$$\displaystyle { 30 }^{ \circ}$$

$$\displaystyle { 45 }^{ \circ }$$

$$\displaystyle { 90 }^{ \circ }$$

$$\displaystyle { 180 }^{ \circ }$$

Solution

Question 6

normal ray, point of reflection

reflected ray, point of refraction

reflected ray, point of incidence

diffracted ray, point of diffraction

Solution

Question 7

regular reflection

irregular reflection

diffused reflection

none of these

Solution

Question 8

A rough curved surface

A highly polished plane surface

Both $$A$$ and $$B$$

None of these

Solution

Question 9

When a single object forms multiple images in one single mirror

When a single object forms multiple images in different mirrors

When a single mirror form multiple images of multiple objects

All of the above

Solution

Question 10

no image will be formed

infinite number of images will be formed

brightness of the images will decrease

images are erect

Solution

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