To get eight images of a single object one should have two plane mirror at an angle of:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 40°
Number of images (n) = $\frac{360°}{θ}-1$ [θ = Angle between the mirrors]
$⇒8=\frac{360°}{θ}-1$
$⇒θ=\frac{360°}{9}=40°$