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Physics

Assertion (A) : Concave mirror is used as doctor's head mirror.

Reason (R) : If a parallel beam of light is incident on a concave mirror, the mirror focuses the beam to a point.

  1. both A and R are true and R is the correct explanation of A
  2. both A and R are true and R is not the correct explanation of A
  3. assertion is false but reason is true
  4. assertion is true but reason is false

Reflection of Light

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Answer

both A and R are true and R is the correct explanation of A

Explanation

Assertion (A) is true: A concave mirror is used as a doctor's head mirror because it can direct and concentrate light into the patient’s body parts (such as teeth, nose, throat, ear, etc.) for better visibility.
Reason is true: When a parallel beam of light (like light from a lamp) falls on a concave mirror, the mirror reflects and converges the rays to its focal point, producing a bright, concentrated spot of light.
This property of focusing parallel rays to a point is precisely why concave mirrors are used in head mirrors, as it enables the doctor to project an intense beam exactly where it is needed. Therefore, the reason correctly explains the assertion.

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