A concave mirror has a radius of curvature of 40cm.at what distance from the pole of the mirror a parallel beam of llight would be focused after reflection
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2
Hiiii....
When parallel rays strike on canvave mirror from infinity they focused at focus after reflection......
R = 40 ...
Hence ... f = R / 2 = 20 cm ......
When parallel rays strike on canvave mirror from infinity they focused at focus after reflection......
R = 40 ...
Hence ... f = R / 2 = 20 cm ......
Answered by
4
Hi !
Radius of curvature = R = 40 cm
When an incident ray hits the mirror , and is parallel to the principal axis, then the rays would be reflected back by passing through the focus(f)
We know that,
R = 2f
hence,
f = R/2
= 40/2
= 20 cm
At a distance of 20 cm from the mirror, the parallel beam of light would be focused , after reflection.
Radius of curvature = R = 40 cm
When an incident ray hits the mirror , and is parallel to the principal axis, then the rays would be reflected back by passing through the focus(f)
We know that,
R = 2f
hence,
f = R/2
= 40/2
= 20 cm
At a distance of 20 cm from the mirror, the parallel beam of light would be focused , after reflection.
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