Question

True or false: (A) if the power of Lens is 2D, its focal length is 0.5m.​

Answer 1

Answer:

yes,the statement is true

Answer 2

Answer:

The focal length of the lens is $0.5$ $m$. The statement is True.

Explanation:

• The ability of the lens to converge or diverge the beam of light falling on it is called the power of the lens.
• The reciprocal of the focal length gives the value of the power of the lens.

The formula of the power of the lens is:

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

where $f$ is the focal length (in meter)

It is given that the power of the lens is $2D$.

The focal length, $f=\frac{1}{2D}$

                                $= 0.5$ $m$

So, the focal length of the lens is $0.5$ $m$.

The statement is True.