Question

Pls ANSWER Q 45
URGENT.

NEED FULL EXPLANATION.
DoNt Spam​

Answer 1

The required answer is option c.

Answer 2

Answer:

As the fish sees through the diameter of the circle hence the radius be r and the depth from the top to the fish be h. The fish sees through an angle of C.

So, tanC = r/h.

So, r= h*tanC.

So, r=h*sinC/cosC.

So, r = hsinC/√(1-sin^2C).

Now, we know that the value of sinC will be 1/n, where n is the refractive index of water.

So, r = h*1/n / √(1 - 1/n^2).

So, r = h / √(n^2 - 1).

So, the diameter of the circle will be twice the radius.

Diameter = 2h/√(n^2 - 1).