Physics
(i) Define critical angle.
(ii) State one important factor which affects the critical angle of a given medium.
Refraction Plane Surfaces
ICSE 2019
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Answer
(i) Critical angle is the angle of incidence in the denser medium corresponding to which the angle of refraction in the rarer medium is 90°.
(ii) The refractive index of the medium affects the critical angle of a given medium.
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