Question
Draw a neat diagram of a pinhole camera. Explain the image formation process using it.
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Answer
self
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I. It is essential for breathing of living organisms.
II. It is used to disinfect water.
III. It absorbs ultraviolet rays.
IV. Its proportion in air is about 3%.
Which of these statements are correct?
(a) I, II and III
(b) II and III
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(d) All of the above
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