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Geometrical Optics question

2016 · 9 Apr · Shift 1 · Q50
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Geometrical Optics question

2016 · 9 Apr · Shift 1 · Q50

JEE MainPhysicsGeometrical OpticsMCQ+4 / −1
To find the focal length of a convex mirror, a student records the following data :

Object
Pin		 Convex
Lens		 Convex
Mirror		 Image
Pin
22.2 cm 32.2 cm 45.8 cm 71.2 cm


The focal length of the convex lens is f1 and that of mirror is f2. Then taking index correction to be negligibly small, f1 and f2 are close to :
  1. A
    f1 = 12.7 cm f2 = 7.8 cm
  2. B
    f1 = 7.8 cm f2 = 12.7 cm
  3. C
    f1 = 7.8 cm f2 = 25.4 cm
  4. D
    f1 = 15.6 cm f2 = 25.4 cm
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