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You need special optics to focus infra-red.

The longer wavelengths do not focus at the same point (they are bent less by refraction).

Mirror optics are better.

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You need special optics to focus infra-red.

The longer wavelengths do not focus at the same point (they are bent less by refraction).

Mirror optics are better.

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condenser adjustment allow you to focus the optics properly into your eye

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think

focus

concentrate

thank you!!

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Albert A. Michelson has written:

'Studies in optics'

'Studies in optics' -- subject(s): Optics

'Studies in optics' -- subject(s): Optics

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Variously: physics, optics, quantum mechanics, etc.

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