Question

Find the focal length of a lens of power + 0.5 D.​

Answer 1

Explanation:

I hope you get the answer!!!

Answer 2

Answer:

Focal length of lens = 200 cm, Convex Lens  

Explanation:

The power of lens given in the question is 0.5D

To find the focal length of lens we use the formula of

D=100/f(cm)

Putting the value of Power = 0.5D, we get:

0.5=100/f

Therefore, the focal length of lens is  

f=200 cm

or, 2m

The nature of the lens is convex; this is because convex lens has converging properties along with being positive. Hence, if the light beam has a source at an infinite length and strikes the lens, all the light beams converge at single point on a focal length.

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