At critical angle, the angle of refraction is _______.

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Solution

At critical angle, the refracted ray grazes along the refracting surface and angle of refraction= $90^{o}$

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At critical angle, the angle of refraction is _______.

At critical angle, the refracted ray grazes along the refracting surface and angle of refraction=90o

At critical angle, the refracted ray grazes along the refracting surface and angle of refraction= $90^{o}$