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Old Feb 28th 2010, 09:54 AM   #1
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intresting question on plano concave lens

) The plane side of a thin plano-convex lens is silvered. Will it act as a convex or concave mirror? Justify your answer by drawing a ray diagram. The material of lens has refractive index 1.5. What is the radius of curvature of the curved surface of lens if the focal length of the mirror is 40 cm? I am hung in 2 paramers R1 and R2 in formula
1/f=(mu-1)(1/R1 +1/R2 )
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Old Feb 28th 2010, 11:01 PM   #2
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If a parallel beam of light fall on the plano-convex lens what happens to the rays? After reflation from the mirror in the backside what happens to the reflected rays? This will decide the nature of the silvered plano-convex lens.
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Old Feb 28th 2010, 11:51 PM   #3
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I wonder you are adding me more confusion by questioning or giving way of solution.
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Old Mar 1st 2010, 02:14 AM   #4
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Originally Posted by binayakafle View Post
I wonder you are adding me more confusion by questioning or giving way of solution.
Instead of giving away the solution directly, I am directing you towards the answer. Just try to answer the questions in my post. Use Snell's law.
Keep in mind one thing. If the emergent rays from the lens are converging, the image is real. Otherwise the image is virtual.
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Old Mar 1st 2010, 09:01 AM   #5
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And what about 2nd part of my question.
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Old Mar 2nd 2010, 12:40 AM   #6
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When a parallel beam of light falls on it, before converging to a point, it refracts twice through the lens and reflects once from the mirror. If you consider the point of convergence as focus of the system, then
1/F = (μ-1)/R + (μ-1)/R.
(μ-1)/R is the focal length of the lens.
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