Which is Incorrect About Lens?

Which one of the following statements is not correct?

  1. The radius of curvature of a concave mirror is twice its focal length
  2. Power of a convex lens is negative and that of a concave lens is positive
  3. The radius of curvature of a plane mirror is infinity
  4. When a ray of light passes from an optically denser medium to an optically rarer medium, the angle of refraction is greater than the corresponding angle of incidence
Anurag Mishra Professor Asked on 30th September 2015 in Physics.
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