An object of height 4 cm is placed at a distance of 20 cm from a concave lens of focal length 10 cm. Use lens formula to determine the position of image formed!
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u = -20
f = 10
using lens formula
1/f = 1/v - 1/u
1/10 = 1/v - (1/-20)
1/10 = 1/v + 1/20
1/10 - 1/20 = 1/v
2-1/20 = 1/v
1/20 = 1/v
v=20
f = 10
using lens formula
1/f = 1/v - 1/u
1/10 = 1/v - (1/-20)
1/10 = 1/v + 1/20
1/10 - 1/20 = 1/v
2-1/20 = 1/v
1/20 = 1/v
v=20
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