A point source is at a distance35cm on theopticalaxos from a sphericalmirror having afocallength 25cm. At whatdistancemeasuredalongthe opticalaxis form the concavemirror shoulda planemirror (perpendicualrto principle axis) be placedfor the imageit forms (due to rays fallingon it afterreflectionfrom theconcave mirror) to coincidewith the pointsource?

A point source is at a distance35cm on theopticalaxos from a spherical

1.	A point source is at a distance35cm on theopticalaxos from a sphericalmirror having afocallength 25cm. At whatdistancemeasuredalongthe opticalaxis form the concavemirror shoulda planemirror (perpendicualrto principle axis) be placedfor the imageit forms (due to rays fallingon it afterreflectionfrom theconcave mirror) to coincidewith the pointsource?
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