First slide

Ray optics

Question

A wire mesh consisting of very small squares is viewed at a distance of 8cm through a magnifying converging lens of focal length 10cm, kept close to the eye. The magnification produced by the lens is

Moderate

A

5
B

8
C

10
D

20

Solution

$u = - 8 cm, f = 10 cm; \frac{1}{f} = \frac{1}{v} - \frac{1}{u} \frac{1}{10} = \frac{1}{v} - (\frac{1}{- 8}); V = - 40 cm; m = \frac{- 40}{- 8} = 5$
virtual image erect on the same side as the object

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