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2014-09-11T22:02:34+05:30
In first case the distance between mirror and object is 20 cm as distance inside the mirror is also be calculated.
in 2 case when object is moved 6 cm towards mirror , the distance will become 8 cm because we are taking the object closer to mirror.so
10 cm - 6 cm = 4 cm.
And distance inside the mirror will also 4 cm.So the total distance in 2 case will be 8 cm
        4cm + 4cm = 8cm
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