HC Verma Chapter 18 Problem 5 – Find n from apparent depth

Given

Real depth 15 cm, apparent depth 10 cm

Find

Refractive index n

Formula

n = real depth / apparent depth

Solution

n = 15/10 = 1.5

Answer

n = 1.5

Diagram / Concept

Simple method to measure n of liquids in lab

Notes

Works only for near-normal incidence