Which is the natural phenomenon based on which a simple periscope works

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Which one of the following is the natural phenomenon based on which a simple periscope works?

1. Reflection of light
2. Refraction of light
3. Dispersion of light
4. Total internal reflection of light

Answer

A periscope works on the laws of reflection. The light from the object falls on one mirror placed at 45° to the object. The reflected light falls on another mirror and is again reflected until it reaches the human eye.

The correct option is A.