a concave mirror is a part of spherical of radius 40 cm what is focal length of the mirror
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Answered by
2
f=r/2
according the question the radius =40cm
f=40/2
f=20
Answered by
1
the radius of spherical is equal to length of the center of curvature of the mirror.
center of curvature=2focal length .
40=2f
f=20
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