5
Question
A plane wavefront AB incident on a concave mirror as shown. Then, the wavefront just after reflection is
A plane wavefront AB incident on a concave mirror as shown. Then, the wavefront just after reflection is
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Solution
The correct option is C
After reflection, every point on the mirror acts as a source resulting in a wavefront.
The wavefront after the reflection can be drawn using the ray diagram as shown in the figure below and Huygens' principle which state that the wavefront is perpendicular to the propagation of the wave.
Hence, option (C) is the correct answer.
Why this question :-
This type of questions can only be solved using ray diagrams and Huygens' principle.
After reflection, every point on the mirror acts as a source resulting in a wavefront.
The wavefront after the reflection can be drawn using the ray diagram as shown in the figure below and Huygens' principle which state that the wavefront is perpendicular to the propagation of the wave.
Hence, option (C) is the correct answer.
| Why this question :- This type of questions can only be solved using ray diagrams and Huygens' principle. |
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