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What factors affects the size of a shadow and how would you derive the diameter of a shadow of a circular object on a flat screen?

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  • $\begingroup$ It's based on the distance and orientation of the light source, whether it becomes an ellipse or a larger circle ;-) $\endgroup$ – Waffle's Crazy Peanut May 30 '13 at 13:19
  • $\begingroup$ If the light source isn't pointlike, the shadow doesn't have sharp edges. $\endgroup$ – Ben Crowell May 30 '13 at 15:36
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Instead of the Circular object I use a cardboard with a circular cavity that will behave same as the object, instead the lighted portion on screen would be shadow in that case :)

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$$\tan\theta=\dfrac r d =\dfrac R{d+D} $$

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