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Which of the following contains two plane mirrors or two right angles isosceles prisms placed one above the other?

Which of the following contains two plane mirrors or two right angles isosceles prisms placed one above the other? Correct Answer Line ranger

A line ranger consists of either two plane mirrors or two right angles isosceles prisms placed one above the other. The diagonals of the two prisms are silvered so as to reflect the incident rays.

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