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1. A coneave mirror is a part of sphere of radius 40 cm. What is the focallength of the mirror? |
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Answer» Ans :- Radius of sphere\curvature =40m Now, we are already aware of the relation between Radius of the curvature and focal length of the mirrors. Focal length = half of the radius of the curvature. i.e f = 1\2 C So, f= 1/2 ×40 f=20m |
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