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16. The expos...

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16. The exposure time of a camera lens at f/2.8 setting is 1/200s .The correct time of exposure at f/5.6 is…

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Q. The camera lens has an aperture of f and the exposure time is (1/60)s. What will be the new exposure time if the aperture become 1.4 f ?

Q. Focal number of the lens of a camera is 5f and that of another is 2.5 f. The time of exposure for the second camera is

- ------- -

if that for the first is

\frac{1}{200} s

(G i v e n f = \frac{f o c a l l e n g t h}{a p e r a t u r e})

Q. If the focal length of a lens of a camera is 5 f and that of another is 2.5 f, what is the time of exposure for the second if for the first one

\frac{1}{200} s

? (where, f is focal length/unit aperture)

Q. The time of exposure in a camera is controlled by a:

Q. State whether true or false:

Diaphragm in a photographic camera control the time of exposure of film.

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