The refractive index of crown glass is close to 3/2. If the speed of light in air is c, then the speed of light in the crown glass will be close to
[amp_mcq option1=”(3/2)c” option2=”(4/9)c” option3=”(2/3)c” option4=”(9/4)c” correct=”option3″]
This question was previously asked in
UPSC NDA-2 – 2022
Given that the refractive index of crown glass is close to 3/2, we have n = 3/2.
Using the formula n = c / v, we can rearrange it to solve for the speed of light in the glass (v): v = c / n.
Substituting the given refractive index: v = c / (3/2).
To divide by a fraction, we multiply by its reciprocal: v = c * (2/3) = (2/3)c.