Question

Asked Apr 1, 2019

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One method of measuring the focal length of a lens is to form an image of an object that is many focal lengths away from the lens. Show from equation (1/f=1/o+1/i) that the image distance is approximately equal to the focal length when the object distance is very large (say, o=100f). What happens when the object distance become infinitely far away?

Step 1

The given expression from lens formula,

Step 2

Substitute the values,

Step 3

If the object distance become infinity, the inverse of object distance will be zero.

Thus, from ...

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