Wavefront and Huygens' Principle (Laws of reflection and refraction using Huygens principle ) NEET Questions

Physics - Optics

Wavefront and Huygens' Principle (Laws of reflection and refraction using Huygens principle ) MCQ Questions


13.
Huygens' principle was proposed by:
A.
James Clerk Maxwell
B.
Thomas Young
C.
Christiaan Huygens (Dutch physicist, 1678)
D.
Isaac Newton
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ANSWER :
C. Christiaan Huygens (Dutch physicist, 1678)
14.
In Huygens' construction, the radius of the secondary wavelets emitted from each point of the wavefront at time Ļ„ is:
A.
vĀ² Ļ„
B.
v/Ļ„
C.
v + Ļ„
D.
vĻ„, where v is the speed of the wave in the medium
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ANSWER :
D. vĻ„, where v is the speed of the wave in the medium
15.
The original Huygens' principle has a shortcoming: it predicts a 'backwave' that doesn't actually exist. Huygens addressed this by:
A.
Saying the backwave gets absorbed by the medium
B.
Stating the backwave has zero frequency
C.
Assuming (ad hoc) that the amplitude of secondary wavelets is maximum in the forward direction and zero in the backward direction
D.
Ignoring the backwave entirely without justification
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ANSWER :
C. Assuming (ad hoc) that the amplitude of secondary wavelets is maximum in the forward direction and zero in the backward direction
16.
Huygens' principle is essentially a:
A.
Mathematical formula for calculating wave intensity
B.
Geometrical construction allowing us to determine the shape of the wavefront at a later time given its current shape
C.
Statement about energy conservation
D.
Quantum mechanical principle
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ANSWER :
B. Geometrical construction allowing us to determine the shape of the wavefront at a later time given its current shape
17.
Each point on a wavefront, according to Huygens, becomes:
A.
An antinode
B.
A source of secondary wavelets
C.
A node of standing waves
D.
A point of zero amplitude
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ANSWER :
B. A source of secondary wavelets
18.
Using Huygens' principle, the law of reflection that can be derived states:
A.
The angle of incidence equals the angle of reflection (both measured from the normal)
B.
The angle of reflection is independent of angle of incidence
C.
The angle of incidence is half the angle of reflection
D.
The angle of incidence plus angle of reflection equals 90Ā°
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ANSWER :
A. The angle of incidence equals the angle of reflection (both measured from the normal)