1.

Why in lenses where c is mentioned there 2f is also menstio?

Answer»

It's so because radius is double of FOCUS that is f and C is CENTRE of CURVATURE then line joining c and p will be CALLED radius of curvature and
r
f = r \div 2 \\
r = 2f
and r is equal to distance between c and p so the distance of c from p is 2f that's why it is mentioned as 2f.



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