Question

A convex Hans power 3.0 D is placed in contact with a concave lens of power 2.0 D what is the power of the combination

Answer 1

A convex Hans power 3.0 D is placed in contact with a concave lens of power 2.0 D.

We have to find the power of lens of the combination.

Power of lens is defined as the reciprocal of focal length. And we know that focal length of concave lens is negative and focal length of convex lens is positive.

Now,

P (convex lens) = 3.0 D and P (concave lens) = -2.0 D

As per given condition, we have to find the power of lens of combination (concave and convex lens)

Let's denote the power of lens by P and power of lens for convex lens by P' & power of lens of concave lens by P".

From above data we can say that -

P' = 3D and P" = -2D

Power of lens (combination) = Power of lens of convex lens + Power of lens of concave lens

P = P' + P"

P = 3D + (-2D)

P = 3D - 2D

P = 1D

Answer 2

$\huge\bold\red\bigstar{QueEstion}$

⭐A convex lens power 3.0 D is placed in contact with a concave lens of power 2.0 D what is the power of the combination?

$\huge\bold\blue\bigstar{AnswEr}$

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SOLUTION:

Given,

✴️power of convex lens is 3.0 D.

✴️power of concave lens is 2.0D.

then,

power of combination =power of convex lens+ power of concave lens

=3+(-2)D

=3-2D

=1.0D

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