1.

Two lenses of powers +12D ana+1.0D are placed in contact,then the effective power of combination will be 2 points2.5D1.5D0.5D3.25Dn​

Answer»

Solution :-

<P>As PER the given data ,
  • P 1 = 1.2 D
  • P 2 = 1 D

The effective power of the combination

⇒ P = P 1  + P 2

⇒ P = 1.2 + 1

⇒ P = 2.2 D

Points to remember :

  • The focal length of a concave MIRROR is always NEGATIVE
  • The focal length of a convex mirror is always positive

  • The focal length of a concave lens is always negative
  • The focal length of a convex lens is always positive

  • Distances are always measured from the pole / optical center


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