A person is in a room whose ceiling and two adjacent walls are mirrors. How many images are formed(a) 5(b) 6(c) 7(d) 8
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answer : option (c) 7
explanation : Let number of image formed by two mirror = n
if angle of inclination between two mirror is A= 90°
then, n = 360/A - 1 [ as 360/A = 360/90° = 4 an even number ]
so, n = 4 - 1 = 3 , these images formed by the combination of two adjacent walls will be addition to the object itself act as objects for the ceiling mirror (total objects = 3 + 1 = 4)
hence, the total number of images formed by mirrors = 3 + 4 = 7
explanation : Let number of image formed by two mirror = n
if angle of inclination between two mirror is A= 90°
then, n = 360/A - 1 [ as 360/A = 360/90° = 4 an even number ]
so, n = 4 - 1 = 3 , these images formed by the combination of two adjacent walls will be addition to the object itself act as objects for the ceiling mirror (total objects = 3 + 1 = 4)
hence, the total number of images formed by mirrors = 3 + 4 = 7
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