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9. An object placed 4cm in front of a converging lens produces a real image 12cm
from the lens. What is the magnification of the image? What is the focal length of
the lens? Also draw the ray diagram to show the formation of the image.
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Answer:
u = -4 cm
v = 12 cm (Real image)
(a) m = v/u = 12/-4 = -3
(b) Lens formula: 1/v – 1/u = 1/f
1/12 – 1/-4 = 1/f
(1 + 3)/12 = 1/f
f = 3 cm
Explanation:
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