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  4. The mean distance of sun from the earth is 1.5 × 108 km nearly. The time taken by the light to reach earth from the sun is:

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Q. The mean distance of sun from the earth is $1.5 \times 10^{8} km$ nearly. The time taken by the light to reach earth from the sun is:

Ray Optics and Optical Instruments

Solution:

As we know
$t=\frac{s}{v}$
$t=\frac{1.5 \times 10^{8} \times 1000}{3 \times 10^{8} \times 60}$
$t=\frac{500}{60}=8.33 min$