Wave Optics Test

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Wave Optics Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

In the single slit diffraction, every point on the slit acts

A
to increase intensity

B
as a primary source

C
to decrease intensity

D
as a secondary source

Solution

Every part of the wavefront at the slit acts as secondary sources because the incoming wavefront is parallel to the plane of the slit, these sources are in phase.
Question 2
1 / -0

In the single slit diffraction, the screen is at a large distance as compared to slit width. The different rays from the slit would be

A
inclined

B
parallel

C
anti parallel

D
perpendicular

Solution

The screen on which the fringes are formed is at a large distance. The two or more paths from the slits to the screen were treated as parallel. Parallel paths from the slit are combined at a single point on the screen. This arrangement is often used since it gives more intensity than placing the screen far away.
Question 3
1 / -0

Which of the following phenomenon cannot be explained by diffraction?

A
Fringes observed from a large number of parallel slits

B
Lack of sharp boundary when a point source of light illuminates a straightedge

C
A bulb filament viewed through two blades held so that the edges form a slit

D
The rainbow fringes of an oil slick on water

Solution

The rainbow fringes are obtained due to path difference between the interference of light taking place from upper and lower surface of oil on water.
Question 4
1 / -0

For distances much greater than Fresnel distance ZF

A
travelling of light in a straight line

B
spreading due to diffraction dominates over that due to ray optics

C
No diffraction is observed

D
spreading due to diffraction is small

Solution

There will be broadening of light due to diffraction.
Question 5
1 / -0

We say that a light wave is linearly polarized in y-direction if the wave

A
has only y displacements

B
has only x displacements

C
has only z displacements

D
None of these

Solution

The displacement of the electric field vector takes place along the y-axis for linearly polarised light along the same direction, though the direction of the wave is at the right angle to the electric field vector.
Question 6
1 / -0

If I₀ is the intensity after passing through first Polaroid, then the intensity emerging from the second Polaroid kept at an angle θ to the first is given by

A
I₀cos²θ

B
I₀cos²θ/2

C
2I₀cos²θ

D
I₀cosθ

Solution

As per Malus law, when a beam of completely plane polarized light is passed through the analyzer, the intensity of transmitted light varies directly as the square of the cosine of angle between the plane of polariser and analyzer.

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Wave Optics Test - 5

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Wave Optics Test - 5

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SHARING IS CARING

Question 1

to increase intensity

as a primary source

to decrease intensity

as a secondary source

Solution

Question 2

inclined

parallel

anti parallel

perpendicular

Solution

Question 3

Fringes observed from a large number of parallel slits

Lack of sharp boundary when a point source of light illuminates a straightedge

A bulb filament viewed through two blades held so that the edges form a slit

The rainbow fringes of an oil slick on water

Solution

Question 4

travelling of light in a straight line

spreading due to diffraction dominates over that due to ray optics

No diffraction is observed

spreading due to diffraction is small

Solution

Question 5

has only y displacements

has only x displacements

has only z displacements

None of these

Solution

Question 6

I0cos2θ

I0cos2θ/2

2I0cos2θ

I0cosθ

Solution

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I₀cos²θ

I₀cos²θ/2

2I₀cos²θ

I₀cosθ