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Earlier discussion
2 older comments kept for context.
Usihon Sandra
Right angle is 90 and using the formula:
\(\cfrac{360}{90}-1=\)
\(4-1=3\)
Oluwaseun Adeyemi
No. of image formed = \(\frac{360}{\theta}\) - 1
= \(\frac{360}{90}\) - 1
= 3 images