Geometrical OpticsHard
Question
The figure shows a lens of focal length f and a circular disc of same aperture as that of lens. Parallel lights are falling on the lens. The circular disc is moving away from the lens.
Which of the following graph shows number of photons incidenting on disc as a function of x will be
Which of the following graph shows number of photons incidenting on disc as a function of x will be
Options
A.
B.
C.
D.
Solution
Upto 2f, complete light reaches at disc.
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