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Physics CBSE Live product
Class 7 (2025-26)
Light: Shadows and reflections
Pinhole camera, periscope and kaleidoscope
6.
Uses of kaleidoscope and periscope
Question:
4
m.
Choose the correct answer below:
Periscope
i. Image formed:
Forms multiple repeated images
Forms coloured shadows
Forms blurred images
Forms a clear image
ii. Nature of image:
Images are virtual and symmetrical
Image is virtual and inverted
Image is virtual and erect
Images are real and inverted
iii. Main purpose:
To observe objects that are open and directly visible
To magnify objects
To create beautiful and changing patterns
To observe objects that are hidden or not directly visible
iv. Uses:
Used to measure colour intensity
Used in submarines and by soldiers to observe objects over obstacles
Used for fun and creativity and creating new patterns for designers
Used to read very small letters
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