focal of a converging lens is 20 cm. an object is 60cm from the lens.where will be image formed ?
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Given ;
f = -20cm
u = -60cm
v = ?
By applying mirror's formula
1/f = 1/v + 1/u
1/-20 = (1/v) + (1/-60)
1/v = (1/60)-(1/20)
1/v = (1-3)/60
v = 60/-2
v = -30 cm
Hence the image will be formed at a distance of 30cm in front of the concave mirror.
f = -20cm
u = -60cm
v = ?
By applying mirror's formula
1/f = 1/v + 1/u
1/-20 = (1/v) + (1/-60)
1/v = (1/60)-(1/20)
1/v = (1-3)/60
v = 60/-2
v = -30 cm
Hence the image will be formed at a distance of 30cm in front of the concave mirror.
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