Question

a lens has a power of -0.85d. it is​

Answer 1

Answer:

it is concave lens

Explanation:

We know that power of lens is P= 1/f

P=-25D

So,

f=−.04m=−4cm

The power of this lens has minus sign, so it is a concave lens.

Answer 2

Answer:

Concave lens

Explanation:

Given,

Power = - 0.85 D

Here, the power is negative, therefore the type of lens is concave lens.