As per the question,
The angle between two plane mirror is θ=45∘\theta=45^\circθ=45∘
So, total number of image formed on the mirror, if object is not in the exactly middle of the two mirror, n=360θn=\frac{360}{\theta}n=θ360
n=36045=8n=\frac{360}{45}=8n=45360=8
But if object is placed at the middle of the two mirror,
n=360θ−1=8−1=7n=\frac{360}{\theta}-1=8-1=7n=θ360−1=8−1=7
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