Question

An eye specialist prescribes a power +4.5 D to a
person for his glasses. What is the nature of the
lens and the focal length of the lens?
​

Answer 1

Answer:

Hey!!!

The nature of the lens prescribed is "converging" or "convex lens", as P=+ve.

As, P=1/f

=>f=1/P

=1/4.5

=10/45

=2/9

f=0.22m

OR f=22.22cm

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Answer 2

Explanation:

W.KT

• F=1/D
• F=1/4.5
• F=0.22
• the nature of lens is positive then it is concave lens