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Geometrical Optics question

2017 · 9 Apr · Shift 1 · Q46
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Geometrical Optics question

2017 · 9 Apr · Shift 1 · Q46

JEE MainPhysicsGeometrical OpticsMCQ+4 / −1
In an experiment a convex lens of focal length 15 cm is placed coaxially on an optical bench in front of a convex mirror at a distance of 5 cm from it. It is found that an object and its image coincide, if the object is placed at a distance of 20 cm from the lens. The focal length of the convex mirror is :
  1. A
    27.5 cm
  2. B
    20.0 cm
  3. C
    25.0 cm
  4. D
    30.5 cm
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