Chapter 1: Light - Reflection and Refraction

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Q
Light - Reflection and Reflection

Question:

A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?

Answer:

Here, P = +1.5 D

We know,

1.5 = frac{1}{f}
f = frac{1}{1.5}

f = 0.66 m

Because the focal length is positive, the prescribed lens is converging.


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