Question

calculate number of images formed when we place two plane mirrors at 60 degree

Answer 1

formula
(360/theta)-1

=(360/60)-1
=6-1
=5
so five images are formed
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Answer 2

Multiple images=(360/ theta)-1
Two mirrors placed at=60°
$so = (\frac{360}{60}) - 1 \\ = 6 - 1 \\ = 5 \\ images \: formed = 5$