Soldiers in a trench use a periscope to watch the area above the ground without raising their heads. The figure shows a simple periscope: a long tube with two plane mirrors fixed parallel to each other, one at each end. Light from an object enters the top opening, is reflected down the tube by Mirror 1 and then out to the eye by Mirror 2.

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Laws of Reflection of Light, Periscope and Its Working | PadhAiPro

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CASE_STUDIESLaws of Reflection of LightPeriscope and Its Working3 sub-questions

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