Wave Optics Test

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Wave Optics Test - 7

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Weekly Quiz Competition

Question 1
1 / -0.25

Diffraction also refers to

A
the bending of light around an obstacle

B
the bending of light in a medium

C
the bonding of light to an obstacle

D
None of the above

Solution

Diffraction is defined as the process by which a beam of light or other system of waves is spread out as a result of passing through a narrow aperture or across an edge, typically accompanied by interference between the waveforms produced.
Question 2
1 / -0.25

Shape of the wave front of light emerging out of a convex lens when a point source is placed at its focus.

A
spherical

B
plane

C
conical

D
hyperboloid

Solution

Plane. The shape of the wavefront in case of a light emerging out of a convex lens when a point source is placed at its focus is a parallel grid.
Question 3
1 / -0.25

A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes in a Young ’s double-slit experiment. Find the distance of the third bright fringe on the screen from the central maximum for wavelength 650 nm.

A
1.37 mm

B
1.27 mm

C
1.47 mm

D
9.75 mm

Solution
Question 4
1 / -0.25

A beam of light has a wavelength of 650 nm in vacuum. What is the wavelength of these waves in the liquid whose index of refraction at this wavelength is 1.47?

A
472nm

B
442nm

C
462nm

D
452nm

Solution

We know that,
Wavelength of light in a material:
λ= λ₀ /n
where, λ=wavelength of material, λ₀ =wavelength of light in vacuum,
n=index of refraction of material.
So, 650x10^-9 m/1.47=442.177nm.
Question 5
1 / -0.25

wave front is

A
locus of all adjacent points at which the Electric field is the same

B
locus of all adjacent points at which the phase of vibration of a physical quantity associated with the wave is the same

C
series of points on the wave with same amplitude

D
series of points on the wave with same frequency
Question 6
1 / -0.25

A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes in a Young ’s double-slit experiment. What is the least distance from the central maximum where the bright fringes due to both the wavelengths coincide?

A
1.66 mm

B
1.86 mm

C
1.76 mm

D
1.56 mm

Solution
Question 7
1 / -0.25

A parallel beam of light in air makes an angle of 47.5^∘ with the surface of a glass plate having a refractive index of 1.66. What is the angle between the reflected part of the beam and the surface of the glass?

A
41.5^∘

B
45.5^∘

C
43.5^∘

D
65.9^∘

Solution

The angle of incidence = 90^∘ - 47.5^∘ = 42.5^∘
Now by snells ’laws we get
sin r = sin 42.5^∘ / 1.66^∘
Thus we get r = 24.01^∘
Thus the angle with surface = 90^∘ -24.01^∘ = 65.99^∘
Question 8
1 / -0.25

Shape of the wave front of portion of the wave front of light from a distant star intercepted by the Earth

A
plane

B
spherical

C
hyperboloid

D
conical

Solution

Plane (a small area on the surface of a large sphere is nearly planar). The portion of the wavefront of light from a distant star intercepted by the Earth is a plane.
Question 9
1 / -0.25

Which of the following phenomenon cannot be explained by diffraction?

A
lack of sharp boundary when a point source of light illuminates a straightedge

B
The rainbow fringes of an oil slick on water

C
fringes observed from a large number of parallel slits

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

Solution

The bright colors seen in an oil slick floating on water or in a sunlit soap bubble are caused by interference. The brightest colors are those that interfere constructively. This interference is between light reflected from different surfaces of a thin film; thus, the effect is known as thin film interference.
Question 10
1 / -0.25

According to Huygens principle

A
each point on a wave front is a source of secondary waves

B
each point on a wave front is a sink of secondary waves

C
No point on a wave front is a source of secondary waves

D
None of the above

Solution

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.

According to Huygens 'principle, a plane light wave propagates though free space at the speed of light, c. The light rays associated with this wave-front propagate in straight-lines. It is also fairly straightforward to account for the laws of reflection and refraction using Huygens 'principle.

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Wave Optics Test - 7

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Wave Optics Test - 7

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SHARING IS CARING

Question 1

the bending of light around an obstacle

the bending of light in a medium

the bonding of light to an obstacle

None of the above

Solution

Question 2

spherical

plane

conical

hyperboloid

Solution

Question 3

1.37 mm

1.27 mm

1.47 mm

9.75 mm

Solution

Question 4

472nm

442nm

462nm

452nm

Solution

Question 5

locus of all adjacent points at which the Electric field is the same

locus of all adjacent points at which the phase of vibration of a physical quantity associated with the wave is the same

series of points on the wave with same amplitude

series of points on the wave with same frequency

Question 6

1.66 mm

1.86 mm

1.76 mm

1.56 mm

Solution

Question 7

41.5∘

45.5∘

43.5∘

65.9∘

Solution

Question 8

plane

spherical

hyperboloid

conical

Solution

Question 9

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

The rainbow fringes of an oil slick on water

fringes observed from a large number of parallel slits

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

Solution

Question 10

each point on a wave front is a source of secondary waves

each point on a wave front is a sink of secondary waves

No point on a wave front is a source of secondary waves

None of the above

Solution

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41.5^∘

45.5^∘

43.5^∘

65.9^∘