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Physics CBSE Live product
Class 7 (2025-26)
Light: Shadows and reflections
Pinhole camera, periscope and kaleidoscope
7.
Working of periscope and kaleidoscope
Question:
4
m.
Choose the correct options:
Kaleidoscope
i. Definition:
An optical instrument used to see objects not in the direct line of sight
An optical instrument used to magnify small objects
An optical instrument used to observe distant stars
An optical instrument used to produce colourful and symmetrical patterns
ii. Working principle:
Works on reflection of light by plane mirrors
Works on scattering of light
Works on multiple reflections of light
Works on refraction through lenses
iii. Mirrors used:
Two convex mirrors
Three plane mirrors
Three convex mirrors
Two plane mirrors
iv. Arrangement of mirrors:
Mirrors are placed parallel to each other
Mirrors are flat and placed straight
Mirrors are arranged in a triangular shape inside a tube
Mirrors are fixed at \(45°\) inside a Z-shaped tube
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