Answer:
Option B
Step-by-step explanation:
The phenomenon of bending of light at the interface of two mediums is known as refraction. Refraction occurs when light goes from one medium to another. It bends away from normal when light passes from denser medium to rarer and bends towards the normal when light passes rarer medium to denser medium.
Any lens forms image by bending the light. A mirror forms image when light bounces off its surface that is undergoes reflection. A lens and mirror can be both concave and convex.
Thus, option B is correct.