Question

the phtograph of a ball is taken which is dropped down along a vertical scale from the zero division.during the exposure the ball moved from 40cm division to 90cm division. then time of exposure if the shutter of the camera is​

Answer 1

Answer:

D

Explanation:

Because of the way f-numbers are calculated, a stop doesn't relate to a doubling or halving of the value, but to a multiplying or dividing by 1.41 (the square root of 2). For example, going from f/2.8 to f/4 is a decrease of 1 stop because 4 = 2.8 * 1.41. Changing from f/16 to f/11 is an increase of 1 stop because 11 = 16 / 1.41.

Hence, when the aperture of the camera reduces to half of the original aperture, the exposure time should be half than before.