A. lens and the film
B. diaphragm and the shutter
C. shutter and the film
D. diaphragm and the film

Correct Answer: Option B

B. diaphragm and the shutter

SEE ALSO  A vibrator causes water ripples to travel across the surface of a tank. The wave travels 50cm in 20s and the distance between successive crests is 5cm. Calculate the frequency of the vibrator

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