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Answer on Astronomy | Astrophysics Question for Lia

Question #54962
A 400 cm diameter lens has focal lengths in the blue and red regions of the spectrum given by: FB = 2995 mm, FR = 3000 mm.
(i) What is the value of the focal length corresponding to the position of the circle of least
(ii) What is the linear size of the image of a star at its focal position?
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