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east

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east

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North,South, East and West

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The first sub-cardinal points are;

North East

South East

South West

North west

Each has a 45 degree separation from the two adjacent cardinal points and a 90 degree separation from each adjacent sub-cardinal point

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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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No. It's not necessary.

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