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Blazing goIITian

Joined:	2 Aug 2010
Post:	366

24 Oct 2010 20:20:12 IST

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278

ssssssssssssdddddddddddddddddddd 31-; the focal length of a plane concavo lence is -10 cm th

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ssssssssssssdddddddddddddddddddd 31-; the focal length of a plane concavo lence is -10 cm then its focal length when its plane surface is polished is-;(n=3/2)

Comments (1)

Bhavul Gauri

Cool goIITian

Joined: 14 Jun 2009

Posts: 57

26 Oct 2010 22:05:21 IST

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is the answer infinity?

I suppose, in plano concave lens, the first refracting surface is the plane surface, and if you just silver it, the whole system behaves just as a plane mirror, i.e. the concave part plays no role.

So focal length of new system = infinity

Hope you understand.

Take care.

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