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°
Two plane mirrors inclined at an angle \( \theta \) form multiple images by repeated reflection. For an object on the bisector of the mirrors, with \( 360^\circ/\theta \) a whole number, the number of images is:
\( \displaystyle n = \frac{360^\circ}{\theta} - 1 \)
\( \displaystyle 8 = \frac{360^\circ}{\theta} - 1 \Rightarrow \frac{360^\circ}{\theta} = 9 \Rightarrow \theta = 40^\circ \)