Question

a student is suffering from an eye defect uses a lens of power -0.2D. name the defect of vision and nature of lens used

Answer 1

If student is suffering from an eye defect and uses a lens of power -0.2D, then he is suffering from the defect of vision called myopia.

The nature of lens used to correct this defect is concave lens.

 Let’s find out the focal length of the lens.

Power = 1/ focal length. -2.0

=1/f

  On simplifying we will get,

f = -50cm.

Answer 2

Answer:

If student is suffering from an eye defect and uses a lens of power -0.2D, then he is suffering from the defect of vision called myopia.

The nature of lens used to correct this defect is concave lens.

 Let’s find out the focal length of the lens.

Power = 1/ focal length. -2.0

=1/f

 On simplifying we will get,

f = -50cm.

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