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A concave mirror of focal length 10cm is placed at a distance of 35 cm from a wall. How far from the wall an object be placed so that its image formed by the mirror falls on the wall?
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13
Hello friend
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Focal length of the mirror is 10cm
Distance from the wall is 35cm
It needs to form an image on the wall
That is the image distance will be 35cm
We need to find the object distance
By using mirror formulae
1/f = 1/v + 1/u
Using sign convention
1/-10 = 1/-35 + 1/u
-1/10 + 1/35 = 1/u
(-7+2)/70 = 1/u
-5/70 = 1/u
-1/14 = 1/u
u=-14
The object should be placed at a distance of 14cm infront of the mirror.
It means it should be placed at a distance of 35-14=21cm from the wall
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Hope it helps!
sangeetamittal2:
why did not we add 14 and 35 to find out the distance
The distance-14cm is object distance from the mirror
We need distance between object and wall therefore wall distance(from mirror)-object distance(from mirror)=distance between object and wall
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6
Answer:
Hope this will help you. It is from exam idea 2017-18
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