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One half of a convex lens is covered with a black paper with this lens produced a complete image of the object .Verify your answer .Explain your observation .

Posted by Kritika Sen 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Sia ? 6 years, 3 months ago

Yes, even when one-half of a convex lens is covered with a black paper, the lens will produce a complete image.
Take a live candle, keep it in front of a convex lens mounted on an optical bench.
Move the candle along the axis of bench and take its full image on a screen. Now cover the lower half of lens with a black paper without changing the positions of candle, lens and screen.
You will observe that full image of candle is still seen on the screen, but the intensity of image is reduced. The reason is that a large number of rays incident on the lens are blocked. In the case of covered lower half of lens with black paper, the rays that are emerging from candle and incident on lens are refracted from upper part only and form the full image.

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Posted by Pandey Ji 5 months, 3 weeks ago

CBSE > Class 10 > Science