(Answered) Two stars 15 light-years away are barely resolved by a

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Two stars 15 light-years away are barely resolved by a 67 -cm (mirror diameter) telescope. How far apart are the stars? Assume λ=550nm and that the resolution is limited by diffraction.

Unpolarized light passes through six successive Polaroid sheets each of whose axis makes a 41 °angle with the previous one What is the intensity of the transmitted beam?

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