A microscope may be a combination of:

two convex lenses.

a convex and a concave lens.

two concave lenses.

a convex lens and a convex mirror.

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UPSC NDA-1 – 2024

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A microscope may be a combination of two convex lenses.

A simple microscope consists of a single convex lens. A compound microscope, which provides higher magnification, typically uses at least two lenses: an objective lens and an eyepiece lens. Both the objective lens and the eyepiece lens in a basic compound microscope setup are convex lenses.

The objective lens (convex) forms a real, inverted, and magnified intermediate image of the object. The eyepiece lens (convex) acts as a simple magnifier, forming a virtual, erect (relative to the intermediate image), and further magnified final image that the observer sees. More complex microscope optics may involve combinations of convex and concave lenses or multiple lens elements to correct aberrations, but the fundamental design of a compound microscope relies on two primary convex lenses.

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