Civil Engineering MCQJE Level Civil Engineering
The angle between the two plane mirrors of an optical square is
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Choose the correct answer
A
60 degrees
B
45 degrees
C
90 degrees
D
30 degrees
Correct Answer
B. 45 degrees
Why is this the answer?
The two mirrors of an optical square are set at 45 degrees so that the line of sight is turned through 90 degrees.
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This MCQ belongs to WBPSC JE (Civil) Previous Years Questions Series. Full tests include timed attempts, rank comparison and subject-wise analysis.