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Joined:	3 May 2008
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4 May 2008 11:21:39 IST

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help yaar...

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a beam of light converges to a point P. a lens is placed in the path of the convergent beam 12cm frm P.at what point does the beam converge if the lens is a) a convex lens of focal length 20cm and b) a concave lens of focal length 16cm ....

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harsh

Scorching goIITian

Joined: 3 May 2008

Posts: 288

4 May 2008 21:22:33 IST

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c mon yaar koi to solve karo...

suresan

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Joined: 10 Mar 2008

Posts: 186

5 May 2008 01:23:23 IST

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a).Position of the point of convergence from the convex lens of focal length 20 cm = (12X20)/(12+20)= 7.5 cm.
b). Position of convergance from the concave lens of 12 cm = (12X -16)/(12-16) = 48 cm

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