A convex lens and a concave lens of the same focal length are placed in close contact. What does the combination act as?

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1. A convex lens and a concave lens of the same focal length are placed in close contact. What does the combination act as?

A convergent lens

A divergent lens

A plain, flat sheet of glass with no net optical effect

A mirror

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Since the two lenses have equal but opposite powers, they cancel out entirely, and the combination behaves like a simple flat, non-refracting sheet of glass.