Question

what is the nature of the lens and its focal length the power is + 0.5​

Answer 1

$\mathfrak{\large{\underline{\underline{Given:-}}}}$

Power of lens = +0.5 D

$\mathfrak{\large{\underline{\underline{To find:-}}}}$

Focal length of lens = ?

Nature of lens = ?

$\mathfrak{\large{\underline{\underline{Answer:-}}}}$

We know that the power is the reciprocal of focal length.

★ $\boxed{\sf{P = \frac{100}{f}}}$

focal length is in cm.

$\implies$ $\bold{ \frac{5}{10} = \frac{100}{f} }$

$\implies$ $\bold{f = \frac{100 \times 10}{5} }$

$\implies$ $\bold{f =200cm}$

hence, the focal length of lens is 200 cm.

The nature of lens is Convex or converging lens.