A convex lens of focal length 15 cm forms a real image at a distance of 20 cm from its optical centre. Find the position of the object. Is the image formed by the lens magnified or diminished ? 5
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The required answer for the question is -60 cm .
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A convex lens of focal length 15 cm forms a real image at a distance of 20 cm from its optical centre. Find the position of the object. Is the image formed by the lens magnified or diminished ?
Given data,
f=15cm
v=30cm
h=−5cm
u=?
⇒ f/ 1 = v /1 − u/ 1
⇒ u /1 = v/ 1 − f/ 1
= 1/30 −1/ 15
= 1−2/30
= −1/30
⇒u=−30cm
Also we know that,
m= +v/u
= h ′/h
⇒ −30/30
= h /−5
⇒h=+5
∴object height=5cm
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