Question

Optician has prescribed corrective lens indicating -0.4D. This means the
lens prescribed is convex. its right or wrong?​

Answer 1

Answer:

no the lens prescribed is concave lens.

Explanation:

power of a convex lens is positive and that of a concave lens is negative. Hence, if power is negative this means focal length is negative and we have a diverging lens.

hope it helps...

thanks..

Answer 2

Answer:

the lens is not convex it is concave

Explanation:

The power of concave lens is negative and the opposite of convex i.e negative