Chapter 1: Light - Reflection and Refraction

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Q
Light - Reflection and Reflection

Question:

Find the focal length of a lens of power – 2.0 D. What type of lens is this?

Answer:

Here, P = -2.0 D

The type of lens is concave because the focal length is negative.

We know,

P = frac{1}{f}

-2 = frac{1}{f}

f = frac{1}{-2}

f = -0.5 m


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