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2 identical rods R1 and R2 (n=1.5) have convex ends of radius of curvature=10cm. They are placed with curved surface at a distance d apart. When a point source of light P is placed inside rod R1, on the optical axis 50cm from the curved surface, the rays emanating from P in R1, will be parallel in R2. The distance d=?
a) 60cm
b) 70cm
c) 80cm
d) 90cm

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