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


7.
The shape of the wavefront of light coming from a distant star, as it reaches the Earth, is:
A.
Random
B.
Cylindrical
C.
Spherical with small radius
D.
Plane (essentially, due to enormous distance)
😑 View Answer Rough Work Error
ANSWER :
D. Plane (essentially, due to enormous distance)
8.
Light emerging from a convex lens placed with a point source at its focus produces wavefronts that are:
A.
Plane (parallel rays)
B.
Cylindrical
C.
Spherical diverging
D.
Spherical converging
😑 View Answer Rough Work Error
ANSWER :
A. Plane (parallel rays)
9.
Light emerging from a concave mirror with a point source at its focus produces wavefronts that are:
A.
Cylindrical
B.
Spherical diverging from infinity
C.
Plane (parallel beam emerges)
D.
Spherical converging at infinity
😑 View Answer Rough Work Error
ANSWER :
C. Plane (parallel beam emerges)
10.
Light from a point source converging towards a point (e.g., after passing through a converging lens) has wavefronts that are:
A.
Spherical and diverging from the point
B.
Plane
C.
Cylindrical
D.
Spherical and converging towards the point
😑 View Answer Rough Work Error
ANSWER :
D. Spherical and converging towards the point
11.
According to Huygens' principle:
A.
Every point on a wavefront acts as a source of secondary wavelets, and the new wavefront is the envelope (common tangent) of these secondary wavelets
B.
Light travels in straight lines without bending
C.
The wavefront splits into two equal parts at each point
D.
Every point on a wavefront emits light in only the forward direction
😑 View Answer Rough Work Error
ANSWER :
A. Every point on a wavefront acts as a source of secondary wavelets, and the new wavefront is the envelope (common tangent) of these secondary wavelets
12.
In Huygens' construction, the new position of the wavefront at a later time t = Ī„ is:
A.
The forward envelope (common tangent) of secondary spherical wavelets of radius vĪ„ from each point of the original wavefront
B.
A line of length vĪ„ from each point of the original wavefront
C.
The original wavefront shifted by distance vĪ„ in any direction
D.
A circle of radius vĪ„ centred on a single point
😑 View Answer Rough Work Error
ANSWER :
A. The forward envelope (common tangent) of secondary spherical wavelets of radius vĪ„ from each point of the original wavefront