optics

JEE Main Guidance › Optics questions › optics

the circular boundary of concave mirror subtends a cone of half angle Î¸ at its centre of curvature .The minimum value of Î¸ for which ray incident on this mirror parallel to the principal axis suffers reflection more than one is
(a)30Â°
(b)45Â°
(c)60Â°
(d)75Â°

#Physics #Optics

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5 Answers

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vector ·2009-03-10 07:00:43

??????????

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Abhishek Priyam ·2009-03-10 08:46:05

For minimum Î¸ ray must incident as shown...

clearly.. angle(i)=angle(Î¸)

also 2i=90⁰
i=45⁰
Î¸=45⁰

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vector ·2009-03-10 08:48:22

thanks:) u r crct

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Abhishek Priyam ·2009-03-10 08:52:16

[1]

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Abhishek Priyam ·2009-03-11 03:23:13

bhaiya!! ;)

Kuch bhool nahi gaye... holi hai aaj.... kuch rang ho jaye to acha raehga naa ;p

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