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  a. [Eqn]\pi{r}^{2} \propto[/Eqn] f
  b. [Eqn]\pi{r}^{2} \propto[/Eqn] [Eqn]{f}^{2}[/Eqn]
  c. if lower half is covered by black sheet, then area of image is /2
  d. if f is doubled, intensity will increase

  The correct answer is B..pls reply soon!! ]]> http://forum.100percentile.com/iitjee_aieee_forums/posts/preList/25677/100147.htm http://forum.100percentile.com/iitjee_aieee_forums/posts/preList/25677/100147.htm GMT