Question

Determine height till which water shall be poured into the beaker such that point p can be seen by the observer

Answer 1

Answer:It should be close to the beaker

Explanation:it shuld not be seen from upwards

Answer 2

The height of the water-filled in the container = 12 cm

Explanation:

Let x be the real height of water that should be filled in the container.

Then the apparent height of the water as viewed from the top will be (21-x), as the height of the container is given as 21 cm

Refractive index of the medium = \frac{Real height}{Apparent height}

 Given Refractive index = 4/3

Real height = x

Apparent height = 21-x

\frac{4}{3} = \frac{x}{21-x}

4 (21-x) = 3x

84-4x = 3x

84 = 7x

x = 12cm.

Hence, the height of the water shall be poured into the beaker = 12cm.