KCET · Physics · Ray Optics
The direction of a ray of light incident on a concave mirror is shown by PQ, while direction in which the ray would travel after reflection is shown by four rays marked as A, B, C and D as shown in the figure. Which of the four rays correctly shows the direction of the reflected ray?
- A D
- B C
- C B
- D A
Answer & Solution
Correct Answer
(B) C
Step-by-step Solution
Detailed explanation
According to the rules of reflection for spherical mirrors, an incident ray parallel to the principal axis of a concave mirror passes through its principal focus (\(F\)) after reflection.
In the given figure, the incident ray \(PQ\) is a paraxial ray parallel to the principal axis. Therefore, the reflected ray must pass through the focus \(F\).
Among the given rays, ray \(C\) passes through the principal focus \(F\).
Thus, ray \(C\) correctly shows the direction of the reflected ray.
Answer: C
In the given figure, the incident ray \(PQ\) is a paraxial ray parallel to the principal axis. Therefore, the reflected ray must pass through the focus \(F\).
Among the given rays, ray \(C\) passes through the principal focus \(F\).
Thus, ray \(C\) correctly shows the direction of the reflected ray.
Answer: C
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