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Sahay Sir > Question Answers > Cengage NEET by C.P Singh > Part 2 > Chapter 17 - Refraction of Light by Plane Surfaces > The apparent depth of water in cylindrical water tank of diameter 2Rcm is reducing at the rate of x cm/min when water is being drained out at a constant rate. The amount of water drained in c.c. per minute is (n1= refractive index of air, n2= refractive index of water )

The apparent depth of water in cylindrical water tank of diameter 2Rcm is reducing at the rate of x cm/min when water is being drained out at a constant rate. The amount of water drained in c.c. per minute is (n1= refractive index of air, n2= refractive index of water )

The mean distance of sun from the earth is 1.5×10^8 km. The time taken by light to reach earth from the sun is