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Q45 A plano convex lens is made of material of refrac tive index n When...

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Q45 A plano convex lens is made of material of refrac tive index n When a small object is placed 30 cm away in front of the curved surface of the lens an image of double the size of the object is produced Due to reflec tion from the convex surface of the lens another faint image is observed at a distance of 10 cm away from the lens Which of the following statement s is are true 2016 The refractive index of the lens is 2 5 B The radius of curvature of the convex surface is 45 cm C The faint image is erect and real The focal length of the lens is 20 cm

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