Question

Light is traveling in air at a speed of 300,000 km/s. Which substance would cause the light to refract the LEAST?
A.
ruby (speed of light = 170,000 km/s)


B.
glass (speed of light = 200,000 km/s)


C.
water (speed of light = 225,000 km/s)


D.
diamond (speed of light = 120,000 km/s)

Answer 1

Use the formula n = c / v, where c is the speed of light and v is the speed of light in the environment, that is, use the speed in brackets and the correct answer will be the one that will be the smallest result