Question

please answer this asap​

Answer 1

Answer:

as the seep of light is in versaly propertional then the seep of light will be minimum in R

as u=c/v

then, 1.5=3×10^8/v

and v=3×10^8/1.5=2×10^8m/s

Answer 2

Answer:

R:2.42

Explanation:

Refractive index is directly proportional to optical density (ability of object to bend light) so when refractive index increases optical density increases and hence speed decreases

OR

ACC to snell's law v = c/n

(speed in medium is inversely proportional to refractive index)