Reflection from plane mirrors
Reflection from plane mirrors is a Science & Technology concept from the MPSC syllabus, tested in 2 past MPSC questions (2022, 2023). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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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 ?
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.
दोन समतल आरशामध्ये एक मांजर बसली आहे, जर दोन समतल आरशामधील कोन 30 अंश असल्यास, मांजरीच्या किती प्रतिमा दिसतील ? A cat is sitting in between two plane mirrors. If the angle between two plane mirrors is 30 degrees, how many images of the cat will appear?
Number of images formed by two inclined mirrors is given by formula (360/theta). Here 360/30 = 12. Since 12 is even, the number of images is (12 - 1) = 11.