Camera lenses are described in terms of their focal length. A 50 mm lens has a focal
length of 50 mm. A camera is focused on an
object 13 m away using a 120 mm lens.
Locate the position of the image.
Answer in units of mm.

The position of the image from the camera lens is approximately 121.1 mm

Explanation:

The given parameters of the lens are;

The specification of the camera lens = 120 mm

Therefore, the focal length of the camera lens, f = 120 mm = 0.12 m

The distance of the object from the camera, = 13 m

The lens equation for finding the position of the image is given as follows;

Where;

= The position of the image from the camera lens

Therefore, by plugging in the known values, we have;

The position of the image from the camera lens, = 0.1211 m = 121.1 mm

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