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Light — Physics STD 10 — Question

ICSE BoardEnglish MediumSTD 10PhysicsLight1 Mark
Question
(a) Define critical angle.
(b) State one important factor which affects the critical angle of a given medium.
✓

Answer

(a) Critical angle: Angle of incidence in a denser medium for which the angle of refraction in the rarer medium is $90^{\circ}$ is called critical angle.
(b) The colour (or wavelength) of light.

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