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P7 Observing the Universe Topics 1,2 and 3.

Question 1. . In a telescope how is dish diameter linked to wavelength ? . 2. Question 2. . In a pinhole camera, why does a small aperture give a sharp image, and what effect does this have on the depth of field?. 3. Question 3. . A lens has a focal length of 25 cm. What is its

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P7 Observing the Universe Topics 1,2 and 3.

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