Prism binoculars

Physics

example

Periscope

Periscopes are used in order to see the objects that are not in direct line of sight. Its working is based on the laws of reflection. It consists of a set of parallel plane mirrors as shown in the diagram. 

result

Total internal reflecting prism as a plane mirror

Image formed by total reflecting prism is brighter than a plane mirror because all of the incident light is reflected. It is used to deviate light by in periscope and in binoculars.

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Total Internal Reflection and Critical angle

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Optical Fibres

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Critical Angle - Formula

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Applications of Total Internal Reflection

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