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CBSE Class 10 Answered

Difference between focal length and radius of curvature?!
Asked by drhimasingh | 30 Nov, 2019, 12:22: PM
answered-by-expert Expert Answer
focal length is denoted by f 
and radius of curvature is denoted by letter 'R'
The focal length is the distance between the focus (F) and pole (P) of the mirror. 
The distance between the focus F and centre of curvature (C) is called radius of curvature. 
The radius of curvature is twice the focal length of the mirror. Thus, this can be expressed as 
R = 2f 
 
where, R  - radius of curvature and 
f - focal length of mirror
 
Refer the diagram below for understanding the explanation. Observe F, C and P. 

Answered by Shiwani Sawant | 30 Nov, 2019, 12:31: PM

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