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Blazing goIITian

Joined:	12 Jun 2007
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24 Jul 2008 18:34:49 IST

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547

spherical mirrors

Engineering Entrance , Medical Entrance , AIPMT , JEE Main , AIIMS , JEE Advanced , Physics , Optics

A convex and a concave mirror each of focal length f are placed co-axially. They are separated by 4f and their reflecting surfaces face each other. An object is kept on the principle axis at a distance x from the concave mirror such that the final image after two reflections, first on the concave mirror, is on the object itself. Find x in terms of f.

I'm getting the ans as $\frac{-7f + \sqrt{145f^2}}{4}$ but its not the right ans. maybe maybe

Comments (3)

INDRAJA AMBADI

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Joined: 6 Jun 2007

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24 Jul 2008 18:42:11 IST

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Is it the concave mirror image of the image in the convex mirror that u are talking about?

Anand Hegde

Blazing goIITian

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24 Jul 2008 18:52:50 IST

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no.....first reflection is from concave mirror.....this img acts as object for the convex miror

viraat

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Joined: 31 May 2008

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25 Jul 2008 14:57:34 IST

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it can also be possible that light first reaches the convex mirror as reflection takes place from the bulging surface,so it takes less time for light to rech there

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