On a bright sunny day a diver of height h stands at the bottom of a lake of depth H. Looking upward, he can see objects outside the lake in a circular region of radius R. Beyond this circle he sees the image of objects lying on the floor of the lake. If refractive index of water is 4/3, then the value of R is–

Options

A. `3(H-h)//sqrt(7)`
B. `(H-h)//sqrt(7//3)`
C. `3hsqrt(7)`
D. `(H-h)//sqrt(5//3)`

Answer

A