an object is placed 20 cm from a convex mirror. its image is formed 12 cm away from the mirror. find the focal length of the mirror. find size of image if object is of 3 cm
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Answer:
u= -20cm height of object=3cm
v= 12cm
acc to mirror formula,
1/f=1/v +1/u
1/f=1/12-1/20
LCM=60
1/f=5-3/60
1/f=2/60
f=30cm
let height of img be x
-v/u=height of img/height of object
-12/-20= x/3
3/5= x/3
9/5=x
x=1.8cm
Explanation:
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