What is the index for a type of oil if light has a velocity of 2.5 x 10^(8) m/s in this
substance?

1.2

Explanation:

Data obtained from the question include:

Velocity of light in the oil (V) = 2.5x10^8m/s

Velocity of light in air (C) = 3x10^8m/s

Refractive Index (n) =.?

The rafractive index (n) for the oil is given by:

Rafractive index (n) = Velocity in air (V) /velocity in oil (V)

n = C/V

n = 3x10^8 / 2.5x10^8

n = 1.2

Therefore, the Refractive Index of the oil is 1.2.

kepler used the data from tycho blahe (his mentor) to construct the laws of planetary motion.

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle