A ray of light travelling in the direction 1/2(i + √3j) is incident on a plane mirror. After reflection, it travels along the direction 1/2 (i-√3). The angle of incidence is

Question:

Options :

(a) 30 degree
(b) 45 degree
(c) 60 degree
(d) 75 degree

Answer :

(a) 30 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

If a body is executing simple harmonic motion then

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