The Focal Length of a Lens of Power +4 D will be

  • +0.50 meter
  • -0.25 meter
  • +0.25 meter
  • -0.50 meter
Monis Rasool Professor Asked on 7th May 2015 in Physics.
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1 Answer(s)

The Focal length of a lens of power +4D will be +0.25 meter.
Definition of Focus lens
:-
Focal length is the distance between the center of a concave lens or a concave mirror and the focal point of the lens or mirror. The focal length is always positive.

Power of lens = +4D

Focal length =?

Formula of focal length—

Focal length = 1 / power of lens.

Then,

Focal length = ¼

= +0.25 meter.

Hence, the focal length of a lens of power +4D will be +0.25 meter.

 

Anurag Mishra Professor Answered on 10th May 2015.
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