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Human visual resolution

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The human visual resolution is 1 minute of arc. Assuming that you are looking down an isolated road at night.

a. at what distance can you distinguish the two headlights of an approaching car?

A one-inch telescope can resolve two points of light 4.5 arc seconds apart.

b. At what distance can you distinguish the two headlights of an approaching car?

State assumptions.

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The length of an arc S on a ...

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