Give your opinion about radius of curvature of a convex lens having different F1 and F2 - What would the lens called having equal F1 and F2-

The lens is the optical device which converges the light rays before transmitting. The lens has the similar shape to genus and a lentil is called the lens. ...

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Question

Give your opinion about the radius of curvature of a convex lens having different focal lengths $F_{1}$ and $F_{2}$ ? What would the lens called have an equal focal length?

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Solution

The sides of the lens which have different focal lengths have different kinds of curved sides. They appear to us different when we see them from different sides.
When a convex lens has focal length $F_{1}$ and $F_{2}$ are equal (both sides have equal focal length) it called biconvex lenses

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Give your opinion about the radius of curvature of a convex lens having different focal lengths F1 and F2 ? What would the lens called have an equal focal length?

Give your opinion about the radius of curvature of a convex lens having different focal lengths $F_{1}$ and $F_{2}$ ? What would the lens called have an equal focal length?