An 16 m tall vase is located 50 m in front of a lens. An image is produced 20 m away from the lens. What is the focal length?

f = 14.28 m

Explanation:

Given that,

Object distance, u = -50 m

The image distance from the lens, v = +20 m

We need to find the focal length of the lens. Let the focal length is f. Using the lens formula,

Put all the values,

So, the focal length of the lens is equal to 14.28 m.

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