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Blazing goIITian

Joined:	31 Jan 2007
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29 Jan 2008 20:18:15 IST

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557

Please remove my confusion in this qns

None

A convex lens will behave as a concave lens when placed in

1) water 2) oil 3 both 4 none

i know that it will do so when it will be placed in a medium having higher refractive index then i think answer should be 2

but it is given 3 is it correct if yes tell me how as refractive i of lens > water

AFMC 2003 qns

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Comments (6)

anand bhanushali

Blazing goIITian

Joined: 2 Jan 2008

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29 Jan 2008 21:44:00 IST

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printing mistake

Tarin Bansal

Blazing goIITian

Joined: 27 Jul 2007

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29 Jan 2008 22:53:13 IST

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Yup.
Might be a printing mistake.

R U sure the answer shud be 2? What's the refractive index of oil? It is more than glass and water?

vikrant kumar

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Joined: 20 Dec 2007

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30 Jan 2008 13:22:44 IST

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it might b right , oil may have greater mu

ramyani chakrabarty

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30 Jan 2008 18:26:44 IST

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If the RI of the medium in which the lens is placed is more than the RI of the material of the lens, then the lens changes its behavior. A convex lens behaves as a concave lens and vice-versa.

ed ; it is a mistake in Q ( assumed RI of oil is greater than that of lens material )

a b

Blazing goIITian

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2 Feb 2008 00:41:07 IST

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Glass has r.i of 1.5. Oil has more I think. So, answer should be oil.

JAYANTA

Hot goIITian

Joined: 30 Apr 2008

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5 May 2008 11:21:49 IST

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question is misleading...

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