Question

definitions. i) reflection of light. ii) refraction of light. iii) power of lens​

Answer 1

i) When a light bounces from a plane it is called reflection of light.

ii) When a light transfers from rarer to denser medium and bending at the normal is called refraction of light.

I dont know iii)

Answer 2

ii) The change in direction of the path of light when travelling from one medium to another is known as refraction of light... ☺️