Question

which lens are used in spectecal

Answer 1

Hello there..
Concave and Convex....
Both are used...
But it is specifically used...dependent upon the kind of problem..
whether it is Myopia...Or Hyperopia..
Or also called as near sightedness...or far sightedness respectively..

Hope this helps friend..

Answer 2

Answer:

Concave and Convex

Both are use

But it is specifically used dependent upon the kind of problem..

whether it is Myopia Or Hyperopia..

Or also called as near sightedness or far sightedness respectively..

Explanation: