A point source SS is placed midway between two converging mirrors having equal focal length ffas shown in figure (18−E3) Find the values of d for which only one image is formed.
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Both the mirror has same focal length so they will produce one image under two cases :
Case i:
when the source is at distance 2f from each mirror . The source is at C of mirror.
Image will be produced at same point.
so d= 2f+2f= 4f
Case II:
when the source S is the distance f from mirror.the rays from the object after reflecting will emerge parallel so these parallel rays after reflecting from second mirror is the object itself. so only one image is formed.
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