Question

A mirror produces an image of (+)15 cm height, when the object is placed 20 cm away from the mirror. The object is only 10 cm in height. Calculate the focal length of the mirror.​

Answer 1

Answer: Focal length=-60cm

Explanation:

★magnification(m)=-V/U

h(image)/h(object)=-V/U

15/10=-V/-20

V(imagedistance)=3/2×20=30cm

★By,MirrorFormula;

1/V+1/U=1/F

1/30+1/(-20)=1/F

2-3/60=1/F

F=-60cm

Focal length=-60cm

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