WAEC - Physics (2017 - No. 31)
Two plane mirrors are inclined at an angle 20° to each other. Determine the number of images formed when an object is placed between them.
17
18
19
20
คำอธิบาย
The number of images formed = \(\frac{360}{n}\) where the value gotten is odd
else, = \(\frac{360}{n} -1\).
Solving, we have that \(\frac{360}{20} = 18\)
Hence, the no of images formed is 18 - 1 = 17.