Vikas TU
Last Activity: 8 Years ago
The maximum radii with the bulb’s light get refracted would be calculated acoording to TIR phenomena that Tital Internal Reflection.
Hence let a be the angle vertically made by the point source at the bottom.
From snell’s law,
1.33*sina = 1*sin90 (1.33 being the water refractive index)
sina = 1/1.33
or
tana = r/h => 1.14
or
r = 1.14h
Area = pi*r^2 => pi*(1.14h)^2 m^2
