Optical Instruments

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Optical Instruments

The human eye is a remarkably effective organ, but its range can be extended in many ways by optical instruments such as eyeglasses, simple magnifying lenses, motion picture projectors, cameras (including TV cameras), microscopes, and  ” scopes. Many such devices extend the scope of our vision beyond the visible range satellite-borne infrared cameras and x-ray microscopes are just two examples. The mirror and thin-lens formulas can be applied only as approximations to  most sophisticated optical instruments. The lenses in typical laboratory microscopes are by no means “thin.” In most optical instruments the lenses are compound lenses; that is, they are made of several components, the interfaces rarely being exactly  spherical. Now we discuss three optical instruments, assuming, for simplicity, that the thin-lens formulas apply

Simple Magnifying Lens

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Optical Instruments