A point source of light is placed at origin, in air. The equation of wave front of the wave at time t, emitted by source at t = 0, is (take refractive index of air as 1)
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a
x+y+z=ct
b
x2+y2+z2=t2
c
xy+yz+zx=c2t2
d
x2+y2+z2=c2t2
answer is D.
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Detailed Solution
Wave fronts are spherical in shape of radius ct.Equation of sphere x2+y2+z2=r2Put r = ct⇒x2+y2+z2=c2t2