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SSC CGL 2018 MCQ Questions & Answers (English) - ObjectiveMcq

SSC CGL 2018

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ExamSSC CGL2018

SSC CGL 2018 - Questions and Answers

Browse the questions, answers and explanations for SSC CGL in 2018.

1 questions · Page 1 of 1

SSC CGL2018Physics Optics

1.

Total internal reflection occurs when light travels from:

A

Rarer to denser medium at any angle

B

Denser to rarer medium below critical angle

C

Denser to rarer medium at or above the critical angle

D

Rarer to denser medium above critical angle

Correct Answer:

C — Denser to rarer medium at or above the critical angle

Explanation:

Total internal reflection occurs when light passes from a denser to a rarer medium at an angle equal to or greater than the critical angle. It is the principle behind optical fibres.

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