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Problem
Problem
A concave mirror of radius of curvature 20 cm forms image of the sun. The diameter of the sun subtends an angle
1
∘
1^\circ
1
∘
on the earth. Then the diameter of the image is (in cm): (a)
2
π
/
9
2\pi/9
2
π
/9
(b)
π
/
9
\pi/9
π
/9
(c) 20 (d)
π
/
18
\pi/18
π
/18
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