Wave Optics Test

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Wave Optics Test - 37

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Question 1
1 / -0

Huygen's wave theory allows us to know

A
The wavelength of the wave

B
The velocity of the wave

C
The amplitude of the wave

D
The propagation of the wavefront

Solution

Huygen's wave theory explain the propagation of the wavefront.
Question 2
1 / -0

Assertion: No interference pattern is detected when two coherent sources are infinitely close to each other.
Reason : The fringe width is inversely proportional to the distance between the two slits.

A
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion

B
If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion

C
If Assertion is true statement but Reason is false

D
If both Assertion and Reason are false statements

Solution

When $$d $$ is negligibly small, fringe width. $$\beta $$ which is proportional to $$\dfrac 1d $$ may become too large. Even a single fringe may occupy the whole screen. Hence the pattern cannot be detected.
Question 3
1 / -0

Light travels faster in air than that in glass. This is accordance with

A
wave theory of light

B
corpuscular theory of light

C
neither (a) nor (b)

D
Both (a) and (b)

Solution

Huygene's wave theory assumed that the light travels slower in glass than in air. That means for a given geometrical distance in glass, there will be more waves of light than in same distance in air. Consequently, it would seem that wavelength of light decreases as light propagates through air-glass interface.
Question 4
1 / -0

Assertion: A white source of light during interference forms only white and black fringes. Reason: Width of fringe is inversely proportional to the wavelength of the light used.

A
If both assertion and reason are true but the reason is the correct explanation of assertion

B
If both assertion and reason are true but the reason is not the correct explanation of assertion

C
If assertion is true but reason is false

D
If both the assertion and reason are false

E
If reason is true but assertion is false

Solution

A white source of light during interference will form coloured fringes.
Fringe width is given by $$\beta =\dfrac{\lambda D }{d}$$ i.e., it is directly proportional to wavelength.
Question 5
1 / -0

Assertion: The resolving power of a telescope is more if the diameter of the objective lens is more.
Reason: Objective lens of large diameter collects more light.

A
Both assertion and reason are true but the reason is the correct explanation of assertion

B
Both assertion and reason are true but the reason is not the correct explanation of assertion

C
Assertion is true but reason is false

D
Both the assertion and reason are false

E
Reason is true but assertion is false

Solution

The resolving power of a telescope increases as diameter of objective lens increases.
Resolving Power =D1.22λ
where D is diameter of objective and λ is wavelength of light used.
Question 6
1 / -0

Which one of the following does not support the wave nature of light?

A
Photoelectric effect

B
Interference

C
Polarization

D
Diffraction

Solution

Interference, polarisation & diffraction are based on wave theory of light. Photoelectric effect is based on particle nature of photon/light.
Question 7
1 / -0

Which of the following generates a plane wavefront?

A
$$\alpha-rays$$

B
$$\beta-rays$$

C
$$\gamma-rays$$

D
None of these

Solution

When the point source or linear source of light is at very large distance, a small portion of spherical or cylindrical wavefront appears to be plane, such a wavefront is called a plane wavefront.
In the given options none of sources generates plane wavefront, it can be artificially produced by reflection from a mirror or by refraction through a lens.
Question 8
1 / -0

High quality lens system for optical instrument is made by using ..............

A
Concave and convex lens

B
Convex lens

C
Concave lens

D
Concave and convex mirror

Solution

$$ \begin{array}{l} \text { High quality lens system for optical instrument } \\ \text { is made by using concave and convex } \\ \text { lens. } \\ \text { Hence option } \\ \text { A) Convex and concave lens is } \\ \text { correct. } \end{array} $$
Question 9
1 / -0

Doppler's effect is sound in addition of relative velocity between source and observer, also depends while source and observer or both are moving. Doppler's effect in light depend only on the relative velocity of source and observer. The reason of this is.

A
Einstein mass-energy relation.

B
Einstein theory of relativity

C
Photoelectric effect

D
None of the above

Solution

Doppler effect refers to the change in wave frequency during the relative motion between a wave source and it's observer by considering that the Velocity of the observer with respect to the source velocity is negligible.
Question 10
1 / -0

What will happen to the light at the third maxima on both sides of the zeroth fringe in a Young's double slit experiment ?

A
Travels the same distance

B
From the lower opening travels three times farther than light from the upper opening

C
From the upper opening travels three times farther than light from the lower opening

D
From either opening travels 2 wavelengths farther than light from the other opening

E
From either opening travels 3 wavelengths farther than light from the other opening

Solution

For constructive interference in Young's double slit experiment , path difference between two light waves from two openings is given by $$\Delta x=n\lambda$$ where $$n=0,1,2,3.....$$
for third maxima $$n=3$$,
and $$\Delta x=3\lambda$$
therefore we can say that light from either opening travels farther than light from other opening.

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Wave Optics Test - 37

Result

Wave Optics Test - 37

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SHARING IS CARING

Question 1

The wavelength of the wave

The velocity of the wave

The amplitude of the wave

The propagation of the wavefront

Solution

Question 2

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion

If Assertion is true statement but Reason is false

If both Assertion and Reason are false statements

Solution

Question 3

wave theory of light

corpuscular theory of light

neither (a) nor (b)

Both (a) and (b)

Solution

Question 4

If both assertion and reason are true but the reason is the correct explanation of assertion

If both assertion and reason are true but the reason is not the correct explanation of assertion

If assertion is true but reason is false

If both the assertion and reason are false

If reason is true but assertion is false

Solution

Question 5

Both assertion and reason are true but the reason is the correct explanation of assertion

Both assertion and reason are true but the reason is not the correct explanation of assertion

Assertion is true but reason is false

Both the assertion and reason are false

Reason is true but assertion is false

Solution

Question 6

Photoelectric effect

Interference

Polarization

Diffraction

Solution

Question 7

$$\alpha-rays$$

$$\beta-rays$$

$$\gamma-rays$$

None of these

Solution

Question 8

Concave and convex lens

Convex lens

Concave lens

Concave and convex mirror

Solution

Question 9

Einstein mass-energy relation.

Einstein theory of relativity

Photoelectric effect

None of the above

Solution

Question 10

Travels the same distance

From the lower opening travels three times farther than light from the upper opening

From the upper opening travels three times farther than light from the lower opening

From either opening travels 2 wavelengths farther than light from the other opening

From either opening travels 3 wavelengths farther than light from the other opening

Solution

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