Wave Optics Test

Result

Wave Optics Test - 41

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Weekly Quiz Competition

Question 1
4 / -1

In the far field diffraction pattern of a single slit under polychromatic illumination, the first minimum with the wavelength λ₁ is found to be coincident with the third maximum at λ₂ So

A
3 λ₁ = 0.3 λ₂

B
3 λ₁ = λ₂

C
λ₁ = 3.5 λ₂

D
0.3 λ₁ = 3

Solution
Question 2
4 / -1

Light of wavelength λ = 5000Å falls normally on a narrow slit. A screen placed at a distance of 1 m from the slit and perpendicular to the direction of light. The first minima of the diffraction pattern is situated at 5 mm from the centre of central maximum. The width of the slit is

A
0.1 mm

B
1.0 mm

C
0.5 mm

D
0.2 mm

Solution
Question 3
4 / -1

A single slit Fraunhoffer diffraction pattern is formed with white light. For what wavelength of light the third secondary maximum in the diffraction pattern coincides with the second secondary maximum in the pattern for red light of wavelength 6500 Å?

A
4400 Å

B
4100 Å

C
4642.8 Å

D
9100 Å

Solution
Question 4
4 / -1

A single slit of width a is illuminated by violet light of wavelength 400 nm and the width of the diffraction pattern is measured as y. When half of the slit width is covered and illuminated by yellow light of wavelength 600 nm, the width of the diffraction pattern is

A
The pattern vanishes and the width is zero

B
y / 3

C
3y

D
None of the above

Solution
Question 5
4 / -1

The condition for obtaining secondary maxima in the diffraction pattern due to single slit is

A

B

C

D
Question 6
4 / -1

The width of the diffraction band varies

A
Inversely as the wavelength

B
Directly as the width of the slit

C
Directly as the distance between the slit and the screen

D
Inversely as the size of the source from which the slit is illuminated
Question 7
4 / -1

In the diffraction pattern of a straight slit

A
All bands are uniformly bright

B
All bands are uniformly wide

C
Central band is narrower

D
Central band is wider
Question 8
4 / -1

The limit of resolution of an optical instrument arises on account of

A
Reflection

B
Diffraction

C
Polarization

D
Interference
Question 9
4 / -1

Red light of wavelength 625 nm is incident normally on an optical diffraction grating with 2 ×10⁵ lines/m. Including central principal maxima, how many maxima may be observed on a screen which is far from the grating?

A
15

B
17

C
8

D
16

Solution
Question 10
4 / -1

The angular width of the central maximum of the diffraction pattern in a single slit (of width \'a\') experiment, with λ as the wavelength of light is

A

B

C

D