lenses

no idea

An object pin is placed 20cm in front of a convex lens which is 10 cm away from a plane mirror . An inverted image is found at the same position of the object(above the object).
What is the focal length?
thanks

Doc Al

Here are a few hints. Is the image formed by the lens real or virtual? What does a plane mirror do?

Figure out where the image would be if the mirror wasn't there.

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no idea	lenses Tweet An object pin is placed 20cm in front of a convex lens which is 10 cm away from a plane mirror . An inverted image is found at the same position of the object(above the object). What is the focal length? thanks

Doc Al Mentor Blog Entries: 1	Here are a few hints. Is the image formed by the lens real or virtual? What does a plane mirror do? Figure out where the image would be if the mirror wasn't there.