Question

What is the difference between concave mirror and concave lens?​

Answer 1

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A concave mirror is opaque whereas a concave lens is transparent. A concave mirror can form both real, inverted images of various sizes and virtual, erect and enlarged images depending on the position of the object whereas a concave lens forms only virtual, diminished and erect images for all positions of the object.

Answer 2

Answer:

A convex lens or converging lens focuses the light rays to a specific point whereas a concave lens or diverging lens diverges the light rays. ... When these lenses are combined, they produce sharper images. Most of the eyeglass lenses use combinations of convex and concave lenses.