Question: A lens that is optically perfect is still limited by diffraction effects. Suppose a lens has a diameter of 120 mm and a focal length

A lens that is "optically perfect" is still limited by diffraction effects. Suppose a lens has a diameter of 120 mm and a focal length of 640 mm.

(a) Find the angular width (that is, the angle from the bottom to the top) of the central maximum in the diffraction pattern formed by this lens when illuminated with 540-nm light.

(b) What is the linear width (diameter) of the central maximum at the focal distance of the lens?

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