Question

solve it pls by today only​

Answer 1

✨Answer:

Option (A)

✨Explanation:

We have,

✔vel = dis / time

And

Also,

✔n = c/v

Where

n = refractive index

c = speed of light

v = vel in given medium

So ,

✔v = c/n

Now,

✔c/n = distance / time

➡3 x 10^8 / 1.8 = 250/ time

➡Time = 1.8 x 250/ 3 x 10^8

➡Time = 150 x 10^-8

➡Time = 1.5 x 10^-6.

Hence,

Answer : option (A)1.5 x 10^ -6