# 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

confusion?

(ii) What is the linear size of the image of a star at its focal position?

(i) What is the value of the focal length corresponding to the position of the circle of least

confusion?

(ii) What is the linear size of the image of a star at its focal position?

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