What is the focal length of a convex lens, Physics

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Q. What is the focal length of a convex lens of focal length 30 cm in contact with a Concave lens of focal length 20 cm ? Is the system a converging or a diverging lens?

Ignore thickness of the lenses.

Answer

A Focal length of the convex lens f1 = 30cm

A Focal length of the concave lens f2 = - 20cm

A  Focal length of the system of lenses = f

The equal focal length of a system of two lenses in contact is given as

656_What is the focal length of a convex lens.png

Hence the focal length of the combination of lenses is 60 cm. The negative sign specifies that the system of lenses acts a diverging lens.


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