Question

NUM. The speed of light (f = 5.09 x 1014 Hz) in a transparent material is 0.75 times its speed in air. The
absolute index of refraction of the material is approximately
A. 1.3
B. 0.75
C. 2.3
D. 4.0​

Answer 1

Answer:

YOUR answer is C because they depends on refraction

Answer 2

Answer:

The absolute index of refraction of the material is approximately 1.3 i.e.option (A).

Explanation:

The absolute refractive index of refraction of the material is given as,

$\mu=\frac{c}{v}$          (1)

Where,

μ=refrcative index of the material

c=speed of light in air=3×10⁸m/s

v=speed of light in a particular medium of refractive index μ

From the question we have,

v=0.75c    (2)

By substituting equation (2) in equation (1) we get;

$\mu=\frac{c}{0.75c}$

$\mu=1.3$

Hence, the absolute index of refraction of the material is approximately 1.3 i.e.option (A).