An object is placed 12cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the position of the original and final images seen in the mirror is
a)2cm
b)4cm
c)10cm
d)18cm

Question

An object is placed 12cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the position of the original and final images seen in the mirror is 
a)2cm
b)4cm
c)10cm
d)18cm

anonymous · Answer

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distance from the object to the image(original) = 24 cm
distance from the object to the image ( final/ when it is moved in) = 20cm
distnce between = 4 cm