Question

which lens is called convex lens and why it is called biconvex lense
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Answer 1

Answer:

Lenses are classified by the curvature of the two optical surfaces. A lens is biconvex (or double convex, or just convex) if both surfaces are convex. If both surfaces have the same radius of curvature, the lens is equiconvex. A lens with two concave surfaces is biconcave (or just concave).

Explanation:

Answer 2

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The reason for why it is called a convex lens is that it makes parallel light rays to pass through it by bending inwards and converging at a spot just beyond the lens, which is known as the focal point.