Physics, asked by zaki20, 1 year ago

reflection from spherical mirror and find relation between F and R​

Answers

Answered by abhi178
6
according to law of reflection,

angle of incidence = angle of reflection.

e.g., \angle i=\angle r

in ∆BCF,

it is clear that, AB is parallel to CP

so, \angle\alpha=\angle i [alternate angles ]

so, \angle\alpha=\angle r

thus, BCF is an isosceles triangle.

so, CF = FB

now, of the aperture of the mirror is small, then B lies close to P, so that ,

FB ≈ FP

so, FP=CF=\frac{1}{2}CP

here, FP=\textbf{focal length,f}

and CP=\textbf{radius of curvature,R}

e.g., \boxed{\bf{f=\frac{R}{2}}}
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