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Two identical glass rods S 1 and S 2 (refractive index = 1.5) have one convex end of radius of curvature 10 cm. They are placed with the curved surfaces at a distance d as shown in the figure, with their axes (shown by the dashed line) aligned. When a point source of light P is placed inside rod S 1 on its axis at a distance of 50 cm from the curved face, the light rays emanating from it are found to be parallel to the axis inside S 2 . The distance d is 50 cm P S 1 d S 2 S 1

1. 60 cm
2. 70 cm
3. 80 cm
4. 90 cm CAREER POINT CAREER POINT , CP Tower, IPIA, Road No.1, Kota (Raj.), : 0744-6630500 | www.ecareerpoint.com Email: info@cpil.in Page # 19 Paper-1 [ CODE – 05 ]

Correct answer: 70 cm

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