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Calculate two possible distances of an …

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Calculate two possible distances of an object from a convex lens of focal length 20cm so as to obtain an image of double the size of the object.

Posted by Mithali Pattanaik 5 years, 5 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 5 months ago

f=20cm

m=−2(red)

v=2u

Sign convention

u=−ve

v=+ve

f=+ve

Using lens formula,

1/v−1/u=1/f

⇒1/ −2u−1/u = 1/f1

→u=−3f/2 =−3×10/ 2=−15cm

Object should be placed at 15cm in front of the lens.

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