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Solution :

1. The number if images increases, when the measure of the between the two mirror is increased.
2. Infinite images are obtained when the plane mirrors are kept parallel to each other. 
3. The image of the mirror kept at 10 cm in front of plane mirror will be obtained at the distance 10 cm behind the mirror. 
Plane mirror forms virtual and erect images behind the mirror are the same distance as the object's distance.