The distance between an object and its real image formed by a lens is ' $\mathrm{D}$ '. If the magnification…

The distance between an object and its real image formed by a lens is ' $\mathrm{D}$ '. If the magnification is ' $m$ ', the focal length of the lens is
  1. $\left(\frac{m-1}{m}\right) D$
  2. $\frac{m D}{m+1}$
  3. $\frac{(m-1) D}{m^2}$
  4. $\frac{m D}{(m+1)^2}$

Solution

No solution. Refer to answer key.

Asked in: AP EAMCET 2017 (24 Apr Shift 1)

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