Question

An isotropic point source of light is suspended h metre vertically above the centre of circular table of radius r metre. Then, the ratio of illumenances at the centre to that at the edge of the table is

• A. \(1+(\frac {r^2}{h^2})\)
• B. \(1+(\frac {h^2}{r^2})\)
• C. \(\{1+\frac {r^2}{h^2}\}^{\frac 32}\)
• D. \(\{1+\frac {h^2}{r^2}\}^{\frac 32}\)

Answer 1

The Correct Option is C

The correct option is (C): \(\{1+\frac {r^2}{h^2}\}^{\frac 32}\).