Question

i. Write any 2 consequences of refraction of light. [1 Mark]

ii. How is the refractive index of a medium related to the real and apparent depths of an object in that medium? Find the apparent depth of the pool if the actual depth of water is $2\text{m}$. (refractive index of water = $1.33$) $\left[2\text{marks}\right]$

Answer 1

Answer:
i. Consequenses of refraction:
A. Twinkling of stars
B. Early sunrise and delayed sunset
[1 mark]

$\text{(ii)}$ Refractive index of a medium is related to the apparent depth and actual depth by the expression:
$\mu =\frac{\text{Real depth}}{\text{Apparent depth}}$ $\left[1\text{mark}\right]$
Given, Real depth of the pool = $2\text{m}$
Refractive index of water, $\mu =1.33$
Apparent depth = $\frac{\text{Real depth}}{\mu }=\frac{2}{1.33}=1.5\text{m}$$\left[2\text{marks}\right]$