Name a piece of apparatus other than plane mirror, which can be used to turn a ray of light through 90 degree ? Do I need to specify the type of prism used(the isosceles prism) ?

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Solution

Yes, you need to specify the type of prism in this case. A prism of angles (90 45 45) (isosceles prism) is used to deviate a ray. Such action of the prism is used in binocular and camera to invert the image without the loss of intensity.

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