Question

A doctor advise to use -2D lens ,then the focal tength is​

Answer 1

Answer:

The focal length will be 2.56

Answer 2

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_____________________

If the lens power is in " - " negative it is Concave lens .

Power of Lens = 1

_________

Focal length

so, Focal length = 2× 1

____cm

100

Focal length = 50 cm.

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