Light Reflection and Refraction Test

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Light Reflection and Refraction Test - 52

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Weekly Quiz Competition

Question 1
1 / -0

The primary phenomenon in the working of lens is

A
Reflection

B
Refraction

C
Scattering

D
Diffusion

Solution

In a lens, image formation happens using laws of refraction.
Question 2
1 / -0

To find the trace of light in a glass slab using pins, minimum number of pins required are

A
2

B
3

C
4

D
6

Solution

To trace a light ray using pins, two pins can trace only one light ray. Two pins are required for incident ray and two for refracted ray. Light ray inside the slab can be traced to extending the light rays and drawing the boundaries of slab.
Question 3
1 / -0

Occurrence of mirage in deserts in summer is an example of ..........................

A
reflection of light

B
refraction of light

C
propagation of sound

D
conduction of heat

Solution

A mirage is a naturally occurring optical phenomenon in which light rays bend when passing through the layers of the atmosphere with variable density.
Question 4
1 / -0

$$\dfrac {\sin i}{\sin r} = constant$$. This is

A
Newton's law

B
Snell's law

C
Both

D
None

Solution

$$\dfrac {\sin i}{\sin r} = constant$$
This constant is known as the $$refractive\ index$$, denoted by n.
This law is known as Snell's law.
Question 5
1 / -0

Mirror equations for convex mirror and concave mirror are:

A
Same

B
Different

C
Different depending on object position

D
Same for only a few image positions

Solution

Mirror equations are the same for concave and convex mirrors. The only difference is that the concave mirror has a negative value of focal length and the convex mirror has a positive value of focal length as per standard sign convention.
Question 6
1 / -0

A man sees a small stationary fish deep in a very clear lake and shoots it accurately. He will

A
hit the fish

B
miss the fish

C
hit but fish will not die

D
may hit or miss depending on the bullet

Solution

Due to refraction, fish will appear displaced from its actual position. The man sees the apparent position of the fish. Hence, the bullet will miss the fish.
Question 7
1 / -0

Light enters from denser to rarer medium. Choose the correct option.

A
Angle of refraction = Angle of incidence

B
Angle of refraction > Angle of incidence

C
Angle of refraction < Angle of incidence

D
Angle of refraction $$\geq$$ Angle of incidence

Solution

As seen in figure when light travels from denser to rarer medium, light bends away from normal and hence angle of refraction>angle of incidence
Question 8
1 / -0

Laws of refraction to hold good:

A
one medium has to be air

B
one medium has to be glass

C
one medium has to be solid

D
two media should have different optical densities

Solution

Refraction takes place when light passes from one medium to another. These two media should have different optical densities for the laws of refraction to hold good.
Question 9
1 / -0

Due to refraction,

A
Image in the plane mirror is clear

B
Polished black surfaces shine

C
speed of light is constant in all mediums

D
A glass sphere appears attractive

Solution

Due to refraction from glass, light coming out gives a sparkling effect in a glass sphere.
Due to reflection, the image in the plane mirror is clear, and polished black surfaces shine.
The speed of light is different for different mediums.
Question 10
1 / -0

A straight line passing through the two centres of curvature of lens is called:

A
Normal

B
Principal axis

C
Centre axis

D
Diameter axis

Solution

Principal axis is a straight line passing through the two centres of curvature of lens.

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Re-Attempt Weekly Quiz Competition

Light Reflection and Refraction Test - 52

Result

Light Reflection and Refraction Test - 52

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SHARING IS CARING

Question 1

Reflection

Refraction

Scattering

Diffusion

Solution

Question 2

2

3

4

6

Solution

Question 3

reflection of light

refraction of light

propagation of sound

conduction of heat

Solution

Question 4

Newton's law

Snell's law

Both

None

Solution

Question 5

Same

Different

Different depending on object position

Same for only a few image positions

Solution

Question 6

hit the fish

miss the fish

hit but fish will not die

may hit or miss depending on the bullet

Solution

Question 7

Angle of refraction = Angle of incidence

Angle of refraction > Angle of incidence

Angle of refraction < Angle of incidence

Angle of refraction $$\geq$$ Angle of incidence

Solution

Question 8

one medium has to be air

one medium has to be glass

one medium has to be solid

two media should have different optical densities

Solution

Question 9

Image in the plane mirror is clear

Polished black surfaces shine

speed of light is constant in all mediums

A glass sphere appears attractive

Solution

Question 10

Normal

Principal axis

Centre axis

Diameter axis

Solution

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