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Principle of Superposition

Why are the p...

Question

Why are the photographic plates covered with black paper?

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Solution

Photographic films are covered with silver nitrate which is sensitive to light. If light falls on it, it is exposed and can no longer be used.

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Why (D4) do you think Pen Pal showed Skander's photographic plate to a doctor at the hospital?

1896

, Henri Becquerel, a French chemist, by chance left some photographic films covered with a black paper near a sample of uranium. On developing the film, it was found to have been exposed. This led to the discovery of:

Q. Photographic films or plates have ......... as an essential ingredient.

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