What is the focal length of the concave lens

Reference no: EM13516333

A convex lens with f1= 19.9 is mounted 40.0cm to the left of a concave lens. When an object is placed 30.8cm to the left of the convex lens, a real image is formed 60.6cm to the right of the concave lens.

What is the focal length of the concave lens?

f2=___ cm ?

Reference no: EM13516333

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