A ring cavity of perimeter L is formed by placing three plane mirrors arranged at the vertices of triangle with a lens of focal ength f inserted between two of the mirrors. Find a relation between L and f for the cavity to be stable.

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A ring cavity of perimeter L is formed by placing three plane
mirrors arranged at the vertices of triangle with a lens of focal
length f inserted between two of the mirrors. Find a relation
between L and f for the cavity to be stable.
Transcribed Image Text:A ring cavity of perimeter L is formed by placing three plane mirrors arranged at the vertices of triangle with a lens of focal length f inserted between two of the mirrors. Find a relation between L and f for the cavity to be stable.
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