In a 35 mm single lens reflex camera (SLR) the distance from the lens to the fil

Question

In a 35 mm single lens reflex camera (SLR) the distance from the lens to the film is varied in order to focus on objects at varying distances. Over what range must a lens of 75 mm focal length vary if the camera is to be able to focus on objects ranging in distance from infinity down to 0.5 m from the camera

In a 35 mm single lens reflex camera (SLR) the distance from the lens to the film is varied in order to focus on objects at varying distances. Over what range must a lens of 75 mm focal length vary if the camera is to be able to focus on objects ranging in distance from infinity down to 0.5 m from the camera?

Explanation / Answer

from infinity

1/f = 1/u + 1/v

u = infinity 1/u = 0

f = 75 mm = 0.075 m

v = 75 mm = 0.075 m

object distance 0.5 m

1/f = 1/u + 1/v

1/0.075 = 1/0.5 + 1/v

1/v = 1/0.075 - 1/0.5

v = 0.0882 m

diffrence = 0.0132 m

difference = 13.2 mm

d option

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