You cover half of a lens that is forming an image on a screen. Compare what happ

Question

You cover half of a lens that is forming an image on a screen. Compare what happens when you cover the top half of the lens versus the bottom half.

A When you cover the top half of the lens, the top half of the image disappears; when you cover the bottom half of the lens, the bottom half of the image disappears. B The image becomes half as bright in both cases. C When you cover the top half of the lens, the bottom half of the image disappears; when you cover the bottom half of the lens, the top half of the image disappears. D Nothing happens in either case. E The image disappears in both cases.

Explanation / Answer

Option B is correct.     Light rays coming from the both parts of the object reach lens upper and lower half. If we stopp half the lens image brightness is decreased.

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