define principal fous of concave
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principal focus, focus the point on the axis of a lens or mirror to which parallel rays of light converge or from which they appear to diverge after refraction or reflection.
Darshanakhandare:
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it is the point in both the lenses
1st convex
in this lens
if a ray of light passing through focus get parallel to principal axis and a ray of light which parallel to principal axis passes through focus
concave in this a ray of light appears to be emitted from focus
hope it helps you
1st convex
in this lens
if a ray of light passing through focus get parallel to principal axis and a ray of light which parallel to principal axis passes through focus
concave in this a ray of light appears to be emitted from focus
hope it helps you
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