Relation between focal lengh and radius of curvature for convex mirror
Answers
Answered by
2
hey mate,
Ray parallel to the principle axis strike at a point ‘A’ on the mirror.
To make a normal at any point on the spherical mirror a line passing through center of curvature is taken.
As per the rules of reflection: angle of incidence = angle of reflection
∠i = ∠r ........(1)
As OA and CP are parallel to each other, we get
∠ACF = i
And
∠FCA = i ............ from eq.1
∴ ∠ACF = ∠FCA = i
∴ CF = FA
When incident ray comes closer to principle axis FA = FP
∴ CF = FP
Then,
R = CP
R = CF + FP
R = f + f
∴ R = 2f
hope it help you!
Ray parallel to the principle axis strike at a point ‘A’ on the mirror.
To make a normal at any point on the spherical mirror a line passing through center of curvature is taken.
As per the rules of reflection: angle of incidence = angle of reflection
∠i = ∠r ........(1)
As OA and CP are parallel to each other, we get
∠ACF = i
And
∠FCA = i ............ from eq.1
∴ ∠ACF = ∠FCA = i
∴ CF = FA
When incident ray comes closer to principle axis FA = FP
∴ CF = FP
Then,
R = CP
R = CF + FP
R = f + f
∴ R = 2f
hope it help you!
Answered by
0
Answer:
The distance from the pole to the focal point is called the focal length (f). The focal length of a spherical mirror is then approximately half its radius of curvature. It is important to note up front that this is an approximately true relationship. ... Convex mirrors are diverging mirrors
JAI SHRI RAM
Similar questions