Wave Optics Test

Result

Wave Optics Test - 40

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Weekly Quiz Competition

Question 1
4 / -1

The diffraction effect can be observe in

A
Only sound waves

B
Only light waves

C
Only ultrasonic waves

D
Sound as well as light waves
Question 2
4 / -1

When light is incident on a diffraction grating the zero order principal maximum will be

A
One of the component colours

B
Absent

C
Spectrum of the colours

D
White
Question 3
4 / -1

In order to see diffraction the thickness of the film is

A
100 Å

B
10, 000 Å

C
1 mm

D
1 cm
Question 4
4 / -1

Diffraction effects are easier to notice in the case of sound waves than in the case of light waves because

A
Sound waves are longitudinal

B
Sound is perceived by the ear

C
Sound waves are mechanical waves

D
Sound waves are of longer wavelength
Question 5
4 / -1

Direction of the first secondary maximum in the Fraunhoffer diffraction pattern at a single slit is given by (a is the width of the slit)

A

B

C

D

Solution
Question 6
4 / -1

A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of incident beam. At the first maxima of the diffraction pattern the phase difference between the rays coming from the edges of the slit is

A
0

B
π/2

C
π

D
2 π

Solution
Question 7
4 / -1

Diffraction and interference of light suggest

A
Nature of light is electro-magnetic

B
Wave nature

C
Nature of quantum

D
Nature of light is transverse
Question 8
4 / -1

A light wave is incident normally over a slit of width 24 × 10^–5 cm. The angular position of second dark fringe from the central maxima is 30°. What is the wavelength of light ?

A
6000 Å

B
5000 Å

C
3000 Å

D
1500 Å

Solution
Question 9
4 / -1

The condition for observing Fraunhoffer diffraction from a single slit is that the light wavefront incident on the slit should be

A
Spherical

B
Cylindrical

C
Plane

D
Elliptical
Question 10
4 / -1

To observe diffraction the size of an obstacle

A
Should be of the same order as wavelength

B
Should be much larger than the wavelength

C
Have no relation to wavelength

D
Should be exactly λ / 2