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A lens has a power of $+ 0.5 Diopter$ . Which type of lens is this?

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A concave lens of focal length

5 m

A convex lens of focal length

5 m

A convex lens of focal length

2 m

A concave lens of focal length

2 m

answer is C.

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Detailed Solution

The lens is a type of convex lens of

2 m

focal length.
The power of the lens is

0.5 D

. The formula of the power is,

P = \frac{1}{f}

Where

P = power of the lens

f = focal length of the lens in meters

\Rightarrow f = \frac{1}{P}

\Rightarrow f = \frac{1}{+ 0.5}

\Rightarrow f = 2 m

The focal length is equal to

2 m

and since the focal length is positive therefore it is a convex lens.

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