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If 10 objects, tinsels are placed between the mirror of a Kaleidoscope with an inclination...

Physics
JAMB 2025

If 10 objects, tinsels are placed between the mirror of a Kaleidoscope with an inclination of 30º, how many images are formed?

  • A. 110
  • B. 181
  • C. 142
  • D. 210
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Correct Answer: Option A
Explanation

In a kaleidoscope (two plane mirrors inclined at an angle ( \theta )):

\(\text{Number of images of one object} = \frac{360^\circ}{\theta} - 1\)

Given: \(\theta = 30^\circ\)

\(\frac{360}{30}\) = 12

So, images formed by one object: 12 - 1 = 11

For 10 objects (tinsels):
10 x 11 = 110 images formed.

There is an explanation video available below.


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