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varun navandar Grade: 11
        Convex and concave mirror have the same radii of curvature R.The distance between the mirrors is 2R.At what point on the common optical axis of the mirror should a point source of light A be placed for the ray to covarage at point A after being reflected first on convex and then on concave mirror?  
7 years ago

Answers : (1)

harini desiraju
31 Points
										

Ans:R


Sol'n:let the source be at a distance X from concave mirror.Then for convex mirror,


(1/2R-X)-(1/V)=2/R


from this we get, V=R(2R-X)/2X-3R


for concave mirror,we have 


[1/(2R+V)]+(1/X)=2/R


substituting the value of V and furthur solving for X we get X=R.

7 years ago
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