CBSE Class 10 Answered
I have 2 questions.
1:Prove r=2f or f= r=/2.
2:State Mirror Formula.
Asked by ananyachandra90 | 08 Jun, 2019, 09:28: PM
Expert Answer
As shown in the figure ray AB is parallel to CP
So pair of alternate interior angles are equal
Therefore
And
and s we know sides opposite to equal angles are equal
hence
FC=FB
AS the ray AB is very close to principle axis
FB=FP
so
FC=FB=FP
Now
CP=FC+FP
CP=FC+FC
CP=2FC
or
CP=2FP
CP=radiusof curvature(R)
FP=Focal length(f)
Therefore
R=2f
Mirror formula
Answered by Utkarsh Lokhande | 09 Jun, 2019, 08:46: AM
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