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Write ? formula please

Dear Student,
The radius of curvature of mirror is denoted by R. The relation between radius of curvature of mirror and the focal length of the mirror is 
R = 2f
Or 
f = R/2
Hence, 
f = 20/2
f = 10 cm (option b)
Regards

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10 is the answer
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Dear student,
The radius of the curvature of the mirror is defined by the radius of the sphere from which the mirror was cut from. Therefore the radius of curvature of a plane mirror is infinite in length .
Radius of curvature (R)=20 cm
Radius of curvature of a spherical mirror = 2 X focal length (f)
R=2f
f=R/2
f=20/2
f=10
Hence , the focal length of the given spherical mirror is 10 cm .
Therefore , the correct answer is option B .
Hope it will help you
Regards ,
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