Question

The power of lens is -2dioptre. Write its focal length and nature ​

Answer 1

Explanation:

If the power is -2D

the We know formula to find focal length in this case that f = 1 / P

f = - 1 /2

f = -0.5

Here -ve sign shows that it's concave mirror

Answer 2

Answer:

focal length is 1/-2metre

= - 0.5 metre

and

the lens is of concave type

because focal length is negative