Question

A fish is a little away below the surface of a lake. If the critical angle is $49^{\circ},$ then the fish could see things above the water surface within an angular range of $\theta^{0}$ where:

• A. $\theta=49^{\circ}$
• B. $\theta=90^{\circ}$
• C. $\theta=98^{\circ}$
• D. $\theta=24 \frac{1^{\circ}}{2}$

Answer 1

Answer: (C)

According to the question

$\theta=c+c$ (as by the figure)
$\theta=2 c$
$\theta=2 \times 49$
$\theta=98^{\circ}$