Wave Optics Test

Result

Wave Optics Test - 10

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Weekly Quiz Competition

Question 1
4 / -1

In an interference experiment, the spacing between successive maxima or minima is

A
λd / D

B
λD / d

C
dD / λ

D
λd / 4D

Solution
Question 2
4 / -1

In Young's double slit experiment, slit separation is 0.6 mm and the separation between slit and screen is 1.2 m. The angular width is (the wavelength of light used is 4800A°).

A
30 rad

B
8 × 10^-4 rad

C
12 rad

D
70.5 rad

Solution
Question 3
4 / -1

Colours in thin films are due to

A
diffraction phenomenon

B
scattering phenomenon

C
interference phenomenon

D
polarisation phenomenon
Question 4
4 / -1

In a double slit experiment, the distance between slits is increased 10 times whereas, their distance from screen is halved, then what is the fringe width?

A
It remains same

B
Becomes 1/10

C
Becomes 1/20

D
Becomes 1/90
Question 5
4 / -1

To demonstrate the phenomenon of interference we require two sources, which emits radiations of

A
nearly the same frequency

B
the same frequency

C
different wavelength

D
the same frequency and having a definite phase relationship
Question 6
4 / -1

On introducing a thin film in the path of one of the two interfering beams, the central fringe will shift by one fringe width. If μ =1.5, the thickness of the film is (wavelength of monochromatic light is λ)

A
4λ

B
3λ

C
2λ

D
λ

Solution
Question 7
4 / -1

The maximum number of possible interference maxima for slit separation equal to twice the wavelength is Young's double-slit experiment, is

A
infinite

B
five

C
three

D
zero

Solution
Question 8
4 / -1

The ratio of maximum and minimum intensities of two sources is 4 : 1. The ratio of their amplitudes is

A
1 : 3

B
3 : 1

C
1 : 9

D
1 : 16
Question 9
4 / -1

A beam of light of wavelength 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringes on either side of the central bright fringe is

A
1.2 cm

B
1.2 mm

C
2.4 cm

D
2.4 mm

Solution
Question 10
4 / -1

If white light is used in the Newton's rings experiment, the colour observed in the reflected light is complementary to that observed in the transmitted light through the same point. This is due to

A
90° change of phase in one of the reflected waves

B
180° change of phase in one of the reflected waves

C
145° change of phase in one of the reflected waves

D
45° change of phase in one the reflected waves