question_answer

At what angle does a diver seen the setting sun?

A)  At \[0{}^\circ \] to the horizontal

B)  At \[90{}^\circ \] to the horizontal

C)  At \[41{}^\circ \] to the horizontal  

D)  At \[49{}^\circ \] to the horizontal

Correct Answer: C

Solution :

 For air water interface,\[C={{\sin }^{-1}}\frac{8}{9}\approx {{49}^{o}}\] As shown in the above figure, this is the angle which the ray coming from setting sun with the vertical.