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NEET2009PhysicsRay OpticsActual

Assertion : A total reflecting prism is used to erect the inverted image without deviation. Reason : Rays of light incident parallel to base of prism emerge out as parallel rays.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion
  3. CIf assertion is true but reason is false
  4. DIf both assertion and reason are false.

Correct answer

A. If both assertion and reason are true and reason is the correct explanation of assertion

Step-by-step solution

Beam of light incident on face A B , suffers refraction from air to glass and strikes the face A C suffering total internal reflection. The beam now strikes the face B C of the prism at an angle of incidence less than the critical angle hence it suffers refraction from glass to air and bends away from the normal. The beam emerges out parallel to the base. As a result of refraction, on emergence the rays are inverted.

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