Question

Which statement correctly compares the speed of light

A.the speed of light through space is much greater than 3×10^8 m/s
B. This speed of light in glass this much greater than 3 x 10^8 m/s
C. The speed of light in glass is faster than the speed of light in space
D. The speed of light in glass is slower than the speed of light in space

Answer 1

The speed of light in glass is slower than the speed of light through space.

Answer 2

Answer: The correct answer is Option D.

Step-by-step explanation:

Refractive index is defined as the ratio of speed of light in vacuum to the speed of light in medium. It is represented as
`\eta`. Speed of light in vacuum is always equal to
`3* 10^8m/s`

Mathematically,

`\eta=\frac{\text{Speed of light in vacuum}}{\text{Speed of light in medium}}`

If the refractive index is more, the speed of light in that medium will be slow and vice-versa.

As, the refractive index of glass is more than the refractive index of space. Hence, the speed of light will be slower in glass.

Therefore, the correct answer is Option D.