A convex mirror of radius of curvature 18 cm forms image of the sun. The diameter of the sun subtends an angle of 1° on the earth. Then the diameter of the image is ??

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Arun · Answer

Dear Manish As sun is more far from the earth, Then we take u = infinite Focal length = 18/2 cm = 9 cm From the mirror formula 1/v+1/u = 1/f 1/v +1/∞ = 1/9 1/v = 1/9 v = 9 cm And we also know that Angle = 1 o = π/180 Ѳ = d/f d = Ѳf d = π/180 * 9 d = π/20 cm Regards Arun (askIITians forum expert)

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A convex mirror of radius of curvature 18 cm forms image of the sun. The diameter of the sun subtends an angle of 1° on the earth. Then the diameter of the image is ??

A convex mirror of radius of curvature 18 cm forms image of the sun. The diameter of the sun subtends an angle of 1° on the earth. Then the diameter of the image is ??

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