Question

Find the power of a concave lens of focal length 2 cm.​

Answer 1

Answer:

p=1/f

p=1/2cm

p=0.5 cm

Explanation:

first convert it into m

Answer 2

Answer:

A concave lens has negative focal length, so it is to be written with a minus sign. Thus,

Focal length, f=−2=-2 m

Now, Power, p=1f in metresp=1f in metres

P=1−2P=1-2

P=−0.5DP=-0.5D

Thus, the power of this concave lens is, −0.5-0.5 dioptre.

Explanation:

I hope this is useful for you