Q.

A reflecting periscope uses:


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a

Single plane mirror inclined at an angle of  45°

b

Two plane mirrors facing each other and inclined at an angle of  45°

c

Two plane mirrors facing each other and inclined at an angle of  60°

d

None of the above 

answer is B.

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Detailed Solution

A reflecting periscope uses two plane mirrors facing each other and inclined at an angle of 45°. A reflecting periscope consists of a cardboard tube bent twice at 90°. At the bends of the tube of the reflecting periscope, the two plane mirrors are fixed in a manner such that they make an angle of 45°. Also, the problem with the reflecting periscope is that the dust settles on the plane mirrors.
 
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A reflecting periscope uses: