Question

What are the differences between concave and convex lens and mirror?

Answer 1

A convex mirror is opaque whereas a convex lens is transparent.

A convex mirror causes reflection of light whereas a convex lens causes refraction of light.

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

Answer 2

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When an object is near a plane mirror, the image is erect, virtual and of the same size at the object. A concave mirror gives a magnified and erect image of a nearby object whereas a convex mirror gives an erect and diminished image. For the rear view mirror in a car.