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Focal point

The point at which at which light rays passing through a lens come together

Concave lens

A lens that is thicker at the edges than it is in the middle


The light sensitive area at the back of the eye

Convex lens

A mirror that curves out ward

Reflecting telescope

An instrument for viewing distant objects that used a curved mirror at the of it's tube to gather light

Simple microscope

A microscope that uses a signal lens to magnify objects

Electron microscope

A viewing instrument that magnifies objects thousands of times by using a beam of electrons

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