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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 ??
Dear Manish As sun is more far from the earth,Then we take u = infiniteFocal length = 18/2 cm = 9 cmFrom the mirror formula1/v+1/u = 1/f1/v +1/∞ = 1/91/v = 1/9v = 9 cmAnd we also know thatAngle = 1o = π/180 Ѳ = d/fd = Ѳfd = π/180 * 9d = π/20 cm RegardsArun (askIITians forum expert)
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