Question

Find the focal length of a convex lens which produces a virtual image at 10cm from the lens when an object is placed at 5cm from the lens.

Answer 1

hi mate..

lense = convex

case = 6th

u = -5cm

v = -10cm

f = ?

we know that,

1/f = 1/v - 1/u

1/f = 1/-10 - 1/-5

1/f = 1/-10 + 1/5

1/f = -1+2/10

1/f = 1/10

f = 10

hope it helps...

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