The image of an object placed 20cm from a concave mirror is formed at a distance of 30 cm from the mirror calculate the possible focal length of the mirror ?
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Answer:
12 cm
Explanation:
from mirror formula
1/f = 1/V + 1/V
where
U is object distance
V is image distance
f is focal length
Sign convention for concave mirror
f=-f
V=-V=-30 , U=-U=-20
Now substitute these values in mirror formula
we get
1/-f= 1/-30 -1/20
By solving we get
f=12cm
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