Question

Two lenses of powers +12D ana+1.0D are placed in contact,then the effective power of combination will be

2 points

2.5D

1.5D

0.5D

3.25D

n​

Answer 1

Answer:

0.5D

Explanation:

Hope it helps u and plz thank my answer

Answer 2

Solution :-

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