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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u -60cm
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
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
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