Q42 of 117 Page 10

Why are reflecting prisms used in periscopes?

In periscopes, reflecting prisms are used in which the incoming light is reflected perpendicularly and this reflected light is again reflected by another prism to get the image.

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40 What happens to light when it enters a rarer medium from a denser medium? 41 Define 1 dioptre. 43 Do frequency and wavelength change when light travels from one medium to another? 44 How a virtual image bigger than the object can be produced?