Question

what is the difference between plano convex and double convex lens​

Answer 1

Answer:

Plano convex lens has one side plane and another side convex..

Double convex lens has both side convex...

Explanation:

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Answer 2

Answer:

As I am sure you know, bi-convex (BCX) has two curved surfaces (double convex= equal radii) and plano convex (PCX) has one side flat, other side curved. Depending on your application you should choose one or the other. It ultimately comes down to the spherical aberrations.