Subjects
Physics CBSE Live product
Class 7 (2025-26)
Light: Shadows and reflections
Pinhole camera, periscope and kaleidoscope

8. Periscope and its shapes

Question:

3 m.

Observe the image given to choose the correct answer:

1. Can the given tube be used to make a periscope?

No, because it is not Z-shaped
Yes, by fixing two plane mirrors at the ends
Yes, by fixing two plane mirrors at the bends
No, because it has bends

2. Where should the two plane mirrors be fixed inside the tube?

At the two bends of the tube
Anywhere inside the tube
In the middle of the straight parts
At the open ends of the tube

3. What is the role of the upper plane mirror in the periscope?

It reflects light from the object down the tube
It changes the colour of light
It magnifies the image
It blocks extra light

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