In total internal reflection when the angle of incidence is equal to the critical angle for the pair of medium in contact, what will be angle of refraction

Question:

Options :

(a) 90 degree
(b) 180 degree
(c) 0 degree
(d) equal to angle of incidence

Answer :

(a) 90 degree

Answer Steps :

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Forty electric bulbs are connected in series across a 220 V supply. After one bulb is fused, the remaining 39 are connected again in series across the same supply. The illumination will be

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