Mars can be viewed at the unaided eye. The angle subtended by Marsat the surface of the Earth is 8.0 x 10³ rad. Suppose we filter the light from Mars, passing aquasi-monochromatic beam at 550 nm, and wish to observe Young's double pinhole fringes.How far apart, at the very most, could the tiny apertures be? The subtended angle of the Sunis 2.8 x 103 rad. Compare the separation of the apertures from Mars and from the Sun, whichone is closer? Roughly what is the area of coherence on an earth based on aperture screenusing the subtend angle of the Sun?

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Answered: Mars can be viewed at the unaided eye.…

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