Light Reflection and Refraction Test

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Light Reflection and Refraction Test - 47

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Weekly Quiz Competition

Question 1
1 / -0

The angle between reflected ray and the _______ is called angle of reflection

A
normal

B
incident ray

C
reflecting surface

D
none of the above

Solution

Angle of reflection is defined as the angle made by the reflected ray with the normal of reflecting surface.
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

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 4
1 / -0

If the refractive index of water and glass with respect to air are, respectively, $$\displaystyle \frac {4}{3}$$ and $$\displaystyle \frac {3}{2}$$ then what will be the refractive index of glass with respect to water?

A
$$\displaystyle \frac {9}{8}$$

B
$$\displaystyle \frac {8}{9}$$

C
$$\displaystyle \frac {4}{3}$$

D
$$\displaystyle \frac {3}{2}$$

Solution

Refractive index of medium 1 w.r.t. medium 2 is given by,

$$^{2}\mu_{1} = \dfrac{\mu_{1}}{\mu_{2}}$$

Hence according to question,

Refractive index of glass, $$\mu_{g}=\dfrac{3}{2}$$

Refractive index of water, $$\mu_{w}=\dfrac{4}{3}$$

Hence $$^{w}\mu_{g}=\dfrac{\mu_{g}}{\mu{w}}$$

$$^{w}\mu_{g}=\dfrac{9}{8}$$
Question 5
1 / -0

Calculate the magnification of an object if it is kept at a distance of $$3 cm$$ from a concave mirror of focal length $$4 cm$$:

A
$$3$$

B
$$6$$

C
$$9$$

D
$$4$$

Solution

Given:
Object distance $$u=-3cm$$
Focal length $$f=-4cm$$

By mirror formula,
$$\dfrac{1}{u}+\dfrac{1}{v}=\dfrac{1}{f}$$
$$\dfrac{1}{-3}+\dfrac{1}{v}=\dfrac{1}{-4}$$
$$\dfrac{1}{v}=\dfrac{1}{12}$$
So, image distance $$v= +12 cm$$

Magnification $$m=-\dfrac{v}{u}$$
$$=-\dfrac{+12}{-3}=+4$$

Option D is correct.
Question 6
1 / -0

When a ray of light strikes a plane mirror along the normal, the angle of incidence is -

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

B
zero

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

D
none of these

Solution

Angle of incidence is the angle made by incident ray and normal to the mirror. Here, the ray incidents along normal so,
From the figure, angle of incidence$$=0^{\circ}$$.
Question 7
1 / -0

A spherical mirror whose inner hollow surface is the reflecting surface is:

A
Convex mirror

B
Concave mirror

C
Convex lens

D
Concave lens

Solution

A concave mirror is a part of spherical mirror whose inner hollow surface is a reflecting surface.
Question 8
1 / -0

The distance between the pole and centre of curvature of a spherical mirror is called _________ .

A
radius of curvature

B
focal length

C
object distance

D
image height

Solution

The radius of the sphere of which the spherical mirror forms a part is known as radius of curvature of the spherical mirror.
Question 9
1 / -0

Identify the mirror

A
Convex

B
Concave

C
Biconcave

D
Biconvex

Solution

$$ \bf{Convex\ Mirror} $$ is a curved mirror where the reflective surface bulges out, towards the light source.
$$ \bf{Concave\ Mirror} $$ is a curved mirror where the reflective surface is curved inwards.

In the figure, the reflective surface is curved inwards. Therefore, it is a concave mirror. Hence, the correct answer is option B.
Question 10
1 / -0

A spherical mirror with its outer bulging surface as the reflecting surface is a :

A
convex mirror

B
concave mirror

C
plane mirror

D
none of these

Solution

Convex mirror is a part of spherical mirror having its outer bulging surface as reflecting surface.

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Light Reflection and Refraction Test - 47

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Light Reflection and Refraction Test - 47

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Question 1

normal

incident ray

reflecting surface

none of the above

Solution

Question 2

Convex

Concave

Cylindrical

Parabolic

Solution

Question 3

virtual image

real image

artificial image

shadow

Solution

Question 4

$$\displaystyle \frac {9}{8}$$

$$\displaystyle \frac {8}{9}$$

$$\displaystyle \frac {4}{3}$$

$$\displaystyle \frac {3}{2}$$

Solution

Question 5

$$3$$

$$6$$

$$9$$

$$4$$

Solution

Question 6

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

zero

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

none of these

Solution

Question 7

Convex mirror

Concave mirror

Convex lens

Concave lens

Solution

Question 8

radius of curvature

focal length

object distance

image height

Solution

Question 9

Convex

Concave

Biconcave

Biconvex

Solution

Question 10

convex mirror

concave mirror

plane mirror

none of these

Solution

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