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What is the advantage of using prism in place of plane mirror in periscope or binocular? |
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Answer» 1. When total internal reflection occurs from a prism, the entire incident light is reflected back into the denser medium. 2. Whereas in ordinary reflection from a plane mirror, some light is refracted and absorbed. So the reflection is partial. 3. This is the reasons why total reflecting prism is used in place of a plane mirror to deviate the light ray by 90° in a periscope and 180° in a binocular. |
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