Question

A short linear object of length l
lies along the axis of a concave mirror of focal length f at a distance u
from the pole of the mirror. The size of the image is approximately equal to [IIT-JEE 1988; BHU 2003; CPMT 2004]
A) l{{\left( \frac{u-f}{f} \right)}^{1/2}} B) l{{\left( \frac{u-f}{f} \right)}^{2}} C) l{{\left( \frac{f}{u-f} \right)}^{1/2}} D) l{{\left( \frac{f}{u-f} \right)}^{2}}

Answer 1

Full width at half maximum (FWHM) is an expression of the extent of function given by the difference between the two extreme values of the independent variable at which the ..?