Wave Optics Test

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Wave Optics Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

A man wishing to get a picture of a Zebra photographed a white donkey after fitting a glass with black streaks onto the objective of his camera.

A
the image will look like a white donkey on the photograph.

B
the image will look like a Zebra on the photograph.

C
the image will be more intense compared to the case in which no such glass is used.

D
the image will be less intense compared to the case in which no such glass is used.

Solution

The rays coming from the body of the white donkey will interfere with the black streaks on the glass and the final image of a zebra will be produced
Question 2
1 / -0

The radius of a wavefront as the waves propagate

A
decreases

B
increases

C
becomes zero

D
sometimes decreases and sometimes increases.

Solution

As the waves propagates, it goes on creating secondary sources of light, resulting in increase in its radius.
Question 3
1 / -0

Newton postulated his corpuscular theory of light on the basis of:

A
Newton's rings.

B
rectilinear propagation of light.

C
colour through thin films.

D
Dispersion of white light into colours.

Solution

According to Isaac Newton the geometric nature of reflection and refraction of light could only be explained if light was made of particles, referred to as corpuscles that travel in straight line.
Question 4
1 / -0

Huygens's concept of secondary wave

A
allows us to find the focal length of a thick lens

B
is a geometrical method to a find a wavefront

C
is used to determine the velocity of light

D
is used to explain polarisation

Solution

Huygens principle states that "Every point on a wave-front may be considered a source of secondary spherical wavelets which spread out in the forward direction at the speed of light. The new wave-front is the tangential surface to all of these secondary wavelets."
Thus it is geometrical method to find the wavefront.
Question 5
1 / -0

Which of the following cannot be polarised ?

A
Radio waves

B
$$\beta$$ rays

C
Infrared rays

D
$$\gamma$$ rays

Solution

$$ \beta $$ are stream of particles comprising of electrons moving with very high velocity, hence it cannot be polarized, while others can as they are electromagnetic waves.
Question 6
1 / -0

Huygen's concept of wavelets is useful in

A
explaining polarisation

B
determining focal length of lenses

C
determining chromatic aberration

D
geometrical reconstruction of a wavefront

Solution

Huygens considered that light was propagated in longitudinal waves.
Huygen's concept explained the direction of propagation of light waves by geometrical reconstruction of wavefront.
Question 7
1 / -0

At the centre (t = 0) of Newton's ring arrangement, we observe a

A
dark spot

B
bright spot

C
coloured spot

D
None of these

Solution

In Newton ring experiment, the band forms are circular in nature and at the centre there is presence of dark spot due to destructive interference.
Question 8
1 / -0

Soap bubble looks coloured due to

A
dispersion

B
reflection

C
interference

D
None of these

Solution

Colours are seen due to interference between waves reflected from the top and bottom of soap bubble.
Question 9
1 / -0

Polarisation of light establishes

A
corpuscular theory of light

B
quantum nature of light

C
transverse nature of light

D
all of the above

Solution

Polarisation of light establishes that light are transverse in nature, otherwise it was believed that they are longitudinal waves, like the sound waves.
Question 10
1 / -0

The ability of an optical instruments to show the images of two adjacent point objects as separate is called :

A
dispersive power

B
magnifying power

C
resolving power

D
none of these

Solution

By definition, resolving power of an optical instrument is its ability to show two closely adjacent point (closely spaced) as distinct as possible.

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Re-Attempt Weekly Quiz Competition

Wave Optics Test - 17

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Wave Optics Test - 17

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Question 1

the image will look like a white donkey on the photograph.

the image will look like a Zebra on the photograph.

the image will be more intense compared to the case in which no such glass is used.

the image will be less intense compared to the case in which no such glass is used.

Solution

Question 2

decreases

increases

becomes zero

sometimes decreases and sometimes increases.

Solution

Question 3

Newton's rings.

rectilinear propagation of light.

colour through thin films.

Dispersion of white light into colours.

Solution

Question 4

allows us to find the focal length of a thick lens

is a geometrical method to a find a wavefront

is used to determine the velocity of light

is used to explain polarisation

Solution

Question 5

Radio waves

$$\beta$$ rays

Infrared rays

$$\gamma$$ rays

Solution

Question 6

explaining polarisation

determining focal length of lenses

determining chromatic aberration

geometrical reconstruction of a wavefront

Solution

Question 7

dark spot

bright spot

coloured spot

None of these

Solution

Question 8

dispersion

reflection

interference

None of these

Solution

Question 9

corpuscular theory of light

quantum nature of light

transverse nature of light

all of the above

Solution

Question 10

dispersive power

magnifying power

resolving power

none of these

Solution

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