Question

light takes 2 NS to travel a distance of 60 cm in vaccumn amd takes 30 ns to yravel 6m in medium. the critical angle is​

Answer 1

Answer:

Explanation:

t1 = 2ns for 60cm

t2= 30ns for 6m or 600cm

So, 2ns= 60/c          ----(i)

30ns = 600/c/micron

30ns=600micron/c         ----(ii)

From (i) and (ii)

30ns= 10 micron×2ns

Micro= 30/10×2

Sin thita= 1/micron =20/30

Thita = sin inverse (2/3)

I didnot got symbols so wrote it alphabetically.. hope this helps..