Reflection from plane mirrors
Tested in 2 real MPSC questions across 1 year (2023–2023). See it in context on the interactive Concept Graph →
Years it was asked
What you need to know first
Laws of reflectionAngle calculationsMirror formula for multiple images
Real questions that test this
जर एखादी वस्तू 36° अंशात तिरप्या असणाऱ्या दोन समतल आरशांमध्ये समरूप ठेवली, तर किती प्रतिमा तयार होतील ? If an object is placed symmetrically between two plane mirrors inclined at an angle of 36°, then how many images will be formed ?
a)8
b)9✓ Correct
c)10
d)11
The number of images formed by two plane mirrors inclined at an angle theta is given by (360/theta) - 1 if 360/theta is even. Here 360/36 = 10 (even), so 10 - 1 = 9.