An object is placed at a distance of 40cm from a concave mirror of focal length 15cm. If the object is displaced through a distance of 20 cm towards the mirror, By how much distance is the image displaced??.
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heyyy here is ur Ans...
Object distance (u)=-20cm
focal length (f)=-15
mirror formula=1/v+1/u=1/f
1/v=1/f-1/u
1/v=1/-15 -1/(-20)
1/v=1/-15 +1/20
1/v=-4+3/60
1/v=-1/60
therefore v=-60....
hope this helps you......
Object distance (u)=-20cm
focal length (f)=-15
mirror formula=1/v+1/u=1/f
1/v=1/f-1/u
1/v=1/-15 -1/(-20)
1/v=1/-15 +1/20
1/v=-4+3/60
1/v=-1/60
therefore v=-60....
hope this helps you......
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