Two identical glass rods S and S (refractive index= 1.5) have one convex end of radius...

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Two identical glass rods S and S (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 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. The distance d is (A) 60 cm (C) 80 cm S (B) 70 cm (D) 90 cm P 50 cm d S Two identical glass rods S and S (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 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. The distance d is (A) 60 cm (C) 80 cm S (B) 70 cm (D) 90 cm P 50 cm d S

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Answer Answer B 70 c... View the full answer