The radius of curvature of a convex mirror is 40 cm. Find its focal length (Ans: 20 cm)
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Answered by
23
We have given,
R=40cm
Where R is the radius of curvature of the convex mirror(the distance between the pole and the center of curvature of the mirror), we need to find the focal length of the convex mirror(distance between focal point and center of the mirror).
Since the focal length is half the length of the radius of curvature.
Using formula R=2f
Putting values, 40 cm =2f 20 cm =f
The focal length comes out to be 20 cm.
R=40cm
Where R is the radius of curvature of the convex mirror(the distance between the pole and the center of curvature of the mirror), we need to find the focal length of the convex mirror(distance between focal point and center of the mirror).
Since the focal length is half the length of the radius of curvature.
Using formula R=2f
Putting values, 40 cm =2f 20 cm =f
The focal length comes out to be 20 cm.
Answered by
34
we use formula
R = 2F
SO ,
F = R/2
F = 40/2
F = 20 CM
I HOPE IT HELP U
R = 2F
SO ,
F = R/2
F = 40/2
F = 20 CM
I HOPE IT HELP U
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