​Four light bulbs are concealed from an observer by an opaque wall as shown. Without shifting the positions of the observer and the bulbs, how many bulbs can the observer see from the mirror ?

A.  ​1                                                   B.  ​2
C.  ​3                                                   D.  ​4

 Dear student,

There will be two bulbs which will be visible to the observer, because the light on striking the mirror will fall on the two bulbs B3 and B4  which are in line with the reflected ray. So, option B is correct.


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3 is the answer
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