Question No: 4
The relation between focal length (f)and radius of
curvature (r).
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The relationship between focal length and radius of curvature is explained in explanation.
Explanation:
Focal length of lens is the distance between the center of the lens and at the point which the relflected travelling to meet the center axis.
Radius of curvature is the radius of the lens that completely forms a sphere.
(IF YOU WANT EXTRA EXPLANATION BY RAY DIAGRAM RELATION, YOU CAN REFER TO CLASS 10 NCERT SCIENCE TEXTBOOK)
CONCLUSION :-Therefore the radius of curvature is twice the focal length.
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