00:01
In this question we have to calculate the diameter of the raft for the falling situation.
00:05
So firstly let's draw our diagram to answer them the following situation.
00:10
Before that, i must tell you what is the concept used? concept over here used is called total internal reflection.
00:36
All right, so let's just draw over here.
00:54
So this is the raft.
00:56
All right.
00:57
And here is a diamond below the raft.
01:12
So now we see carefully, we can say that this theta c is the critical angle and this is alternate angle.
01:35
So this is also theta c.
01:36
Alright, before that, this is the medium that is water.
01:43
All right.
01:44
So this is refractive index of water and above that that is refractive index of air.
01:56
Now since diamond is kept in a calm water that is mentioned in the question on which a still raft is floating as we can see...