Question

If power of a lens is -2 diopter what the focal length is
.5m
.5cm
-.5m
-.5cm
I will mark the person brainliest who will give the right answer​

Answer 1

Answer:

To find the power of a lens in Ray Optics, the following formula is used.

P = 1/f

Where f is the focal length

If the focal length is given in meters (m), the power of the lens is measured in Dioptres (D),

1/-2

= -0.5

Answer 2

Answer:

• -0.5 cm.

Explanation:

We have,

• Power (p) = -2D

To find,

• Focal length (f)

Solution,

>> Power = 1/Focal length

Substituting the values,

=> -2 = 1/f

=> f = 1/-2

=> f = -0.5

∴ The focal length of the lens is -0.5 cm. Hence, the lens will be concave lens.