When an object is placed 40cm from a div...

When an object is placed 40cm from a diverging lens, its virtual image is formed 20cm from the lens. The focal length and power of lens are

19 cm

17 cm

21 cm

11 cm

Text Solution

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The correct Answer is:

(d) Lens should be convex. Images should be magnified by focal length 16 cm length should lie between f and 2f.
Because corresponding to 6 cm (`gt`f) length image should be magnified.
from the given options, if f = 11 cm.
Then, 6 cm, `gt` f and 11 cm`gt` 16 cm `gt` 22 cm or f`gt`16 cm `gt` 2f

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