The real image of an object place at 60cm from the concave mirror is formed at 20cm from the mirror.Find the focal length???
The real image of an object place at 60cm from the concave mirror is formed at 20cm from the mirror.Find the focal length???
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v=-20cm
by mirror. formula
1/u+1/v=1/f
1/-60+1/-20=-1+-3/60=-4/60=-1/15
so , f=-15cm