Exercises XIII — task. Science CBSE, Class 10.

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Find the focal length of a lens of power

$-2.0\ D$ . What type of lens is this?

Power of lens is,

$P\ =\ 2f$
$P\ =\ \frac{2}{f}$
$P\ =\ f$
$P\ =\ \frac{1}{f}$

Focal length of a lens (

$f$ )

$=$

$m$

Type of lens is,

Convex lens
Concave lens

Important!

Note: Enter your answers with one decimal digit.

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