The sun subtends an angle a half a degree at the pole of a concave mirror which has a radius of curvature of 15 m.Then the size(diameter) of the image of the sun formed by the concave mirror is :
a) 3.5 cm
b) 13.1 cm
c) 7.5 cm
d) 6.55 cm

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Using tan (1/2), find the other lengths.
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