Question

Power of a lens is - 14 D and for the second lens power is +12D, the total power of the two in contact is​

Answer 1

Explanation:

P=P1+P2

=+12−2=+10D

∴f=

P

1

=0⋅1m=10cm

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Answer 2

Given: Power of first lens = -14D,

           Power of the second lens = 12D

To find: Total power of the two lenses in contact.

Solution:

• The power of a lens is measured as the reciprocal of the focal length of the lens
• A lens of less focal length and produces more converging and diverging lens and hence has more power.

Power of lens P = P₁ + P₂

Where P₁ is the power of the first lens, and P₂ is the power of the second lens, and P is the effective power

P = -14 + 12 = -2D

Therefore, the total power of two lenses in contact is -2D.

• The power of a converging lens is positive, and the power of diverging lens is negative.