Suppose you place an object 8 cm in front of a converging lens and the image appears 16 cm on the other side of the lens. what is the focal length of the lens?

5.33 cm

Explanation:

The lens equation states that:

where

f is the focal length

p is the distance of the object from the lens

q is the distance of the image from the lens

In this problem,

p = 8 cm

q = 16 cm ( the sign is positive since the image is real, which means it is formed on the other side of the lens)

Substituting into the equation,

when it gains or loses electrons

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