Ray Optics and Optical Test

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Ray Optics and Optical Test - 36

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Weekly Quiz Competition

Question 1
1 / -0

Fill in the blanks
The ray of light bending away from normal is called _____.

A
Refracted ray

B
Incident ray

C
Emergent ray

D
None of the above

Solution

A ray of light bending away from normal is called the refracted ray.
When light rays move from one medium to another medium then Light Rays deviate towards or away from normal. Deviated rays is called refracted ray.
Question 2
1 / -0

Mark the correct statement

A
Centre of reflecting surface of a spherical mirror is called the centre of curvature

B
Pole lies outside the mirror

C
Pole is represented by Po

D
None

Solution

Pole is the center of a spherical mirror which lies on the principal axis, and is represented by P. Hence none of the options is correct.
Question 3
1 / -0

Which of the following are examples of scattering of light?

A
Blue color of the sky

B
Reddening of the sun at sunrise and sunset

C
Color of water in deep seas and oceans

D
All of the above

Solution

The molecules of water and other fine particles in the atmosphere scatter light of shorter wavelengths at the blue end than light of longer wavelengths at the red end. Thus, when sunlight passes through water and air, the fine particles scatter the blue color more strongly than red. This scattered blue light enters our eyes and makes the ocean and sky appear blue. Near the horizon sunlight passes through thicker layers of air having larger particles that scatter light of longer wavelength such as the red end of the spectrum. Also it travels larger distance at horizon causing most of the light of shorter wavelength at the blue end of the spectrum to scatter away by the small particles of the atmosphere before reaching the earth.
Option D.
Question 4
1 / -0

Why does sun appear reddish at sunrise and sunset?

A
Near the horizon it passes through thick layers of atmosphere having larger particles

B
Sunlight travels longer distance at sunrise and sunset

C
Both A and B

D
None of the above

Solution

Near the horizon sunlight passes through thicker layers of air having larger particles that scatter light of longer wavelength such as the red end of the spectrum. Also it travels larger distance at horizon before reaching the earth. However, light from the Sun overhead travels relatively shorter distance. At noon, the Sun appears white as only a little of the blue color is scattered whereas, near the horizon, most of the light of shorter wavelength at the blue end of the spectrum are scattered away by the small particles of the atmosphere. Therefore, the light that reaches our eyes is of longer wavelength which gives rise to the reddish appearance of the Sun.
Question 5
1 / -0

Why does the sky appear blue?

A
The color of water is reflected on the sky

B
Fine particles in the atmosphere scatter light of shorter wavelength

C
The water molecules in the atmosphere makes the sky appear blue

D
None of these

Solution
Question 6
1 / -0

Mark the correct statement:

A
Centre of curvature is represented by "C"

B
Centre of curvature always lies inside the reflecting surface

C
Centre of curvature always lies in front of mirror

D
All

Solution

The reflecting surface of a spherical mirror forms a part of a sphere. The centre of this sphere is called the centre of curvature of the spherical mirror. The Center of curvature can also be defined as the point in the centre of the sphere from which the mirror was sliced. It is represented by the letter $C$ . Please note that the centre of curvature of the concave mirror lies outside the mirror's reflecting surface. The centre of curvature of a convex mirror behind the mirror.
So, only option-(A) is correct
Question 7
1 / -0

The angle of incidence of a ray for which the angle of refraction is $90^{\circ}$ is called

A
Scattering angle

B
Reflex angle

C
Critical angle

D
Optical angle

Solution

The angle of incidence of a ray for which the angle of refraction is $90^{\circ}$ is called critical angle.
When the angle of incidence of a ray is greater than the critical angle, the refracted ray is in the same medium, i.e., the light is totally reflected in the same medium. This is known as total internal reflection.
Question 8
1 / -0

Out of red light and violet light, which will have more lateral displacement?

A
Violet light

B
Red light

C
Equal

D
None

Solution

Violet color having greater refractive index will undergo more lateral displacement.

Answer-(A)
Question 9
1 / -0

On decreasing the wavelength of light, lateral displacement of the emergent ray ................

A
Decreases

B
Increases

C
Remain same

D
None

Solution

Lateral displacement increases with increase in angle of incidence and also increases with increase in refractive index. since refractive index increases with decrease in wavelength, so does lateral displacement, i.e, lateral displacement is more for violet light than for red.
Question 10
1 / -0

Mark the incorrect statement regarding mirror formula.

A
Values of known and unknown parameters can be used with their proper signs

B
Sign of unknown parameter comes of its own after calculation

C
Mirror formula is applicable for both concave and convex mirrors

D
All

Solution

The values of known parameter should be used with their proper sign convention. No sign should be attached to the unknown parameter during calculation. Its sign will come of its own after calculation.

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Re-Attempt Weekly Quiz Competition

Ray Optics and Optical Test - 36

Result

Ray Optics and Optical Test - 36

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SHARING IS CARING

Question 1

Refracted ray

Incident ray

Emergent ray

None of the above

Solution

Question 2

Centre of reflecting surface of a spherical mirror is called the centre of curvature

Pole lies outside the mirror

Pole is represented by Po

None

Solution

Question 3

Blue color of the sky

Reddening of the sun at sunrise and sunset

Color of water in deep seas and oceans

All of the above

Solution

Question 4

Near the horizon it passes through thick layers of atmosphere having larger particles

Sunlight travels longer distance at sunrise and sunset

Both A and B

None of the above

Solution

Question 5

The color of water is reflected on the sky

Fine particles in the atmosphere scatter light of shorter wavelength

The water molecules in the atmosphere makes the sky appear blue

None of these

Solution

Question 6

Centre of curvature is represented by "C"

Centre of curvature always lies inside the reflecting surface

Centre of curvature always lies in front of mirror

All

Solution

Question 7

Scattering angle

Reflex angle

Critical angle

Optical angle

Solution

Question 8

Violet light

Red light

Equal

None

Solution

Question 9

Decreases

Increases

Remain same

None

Solution

Question 10

Values of known and unknown parameters can be used with their proper signs

Sign of unknown parameter comes of its own after calculation

Mirror formula is applicable for both concave and convex mirrors

All

Solution

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