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Home » A point source is placed in air. The spherical wavefront has radius ‘ ‘ after time ‘t’. If the same point source is placed in the medium of refractive index ‘ ‘, the radius of spherical wavefront in the medium in same time isA. B. C. D.
A point source is placed in air. The spherical wavefront has radius ‘ r_{\mathrm{a}} ‘ after time ‘t’. If the same point source is placed in the medium of refractive index ‘ \mu ‘, the radius of spherical wavefront in the medium in same time t is
A. \frac{r_{a}}{\mu}
B. \frac{r_{a}}{\mu^{2}}
C. \mu . r_{a}
D. \mu^{2} \cdot r_{a}
Physics
A point source is placed in air. The spherical wavefront has radius ‘ r_{\mathrm{a}} ‘ after time ‘t’. If the same point source is placed in the medium of refractive index ‘ \mu ‘, the radius of spherical wavefront in the medium in same time t is
A. \frac{r_{a}}{\mu}
B. \frac{r_{a}}{\mu^{2}}
C. \mu . r_{a}
D. \mu^{2} \cdot r_{a}

Correct answer is A.

Here
Velocity of wave front =\frac{R_{9}}{t}
\begin{array}{l} u=-1 \\ \frac{e}{R a / t}=1 \\ e=R a / t \end{array}
in the meduim u
\text { velochy }=R \frac{a}{t}
so, \mu=\frac{L}{2}=\frac{R_{a} \mid t}{R_{a} \mid t^{\prime}}
R_{p} t=\frac{R_{o}}{u}

i

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