What should be the angle between two plane mirrors so that whatever be the angle of incidence, the incident ray and the reflected ray from the two mirrors be parallel to each other

Question:

Options :

(a) 60 Degree
(b) 90 Degree
(c) 120 Degree
(d) 175 Degree

Answer :

(b) 90 Degree

Answer Steps :

step 1

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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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