A pebble lies at the bottom of a tank containing an unknown transparent liquid

PHYSICS · Single correct · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction

Problem

A pebble lies at the bottom of a tank containing an unknown transparent liquid. Its real depth is

20\,\text{cm}

, but when viewed from directly above, it appears to be only

15\,\text{cm}

deep. Determine the refractive index of the liquid. (a)

1.50

(b)

4.00

(c)

1.33

(d)

1.25