NCERT Solutions for Class 8 Science Chapter 13
Important NCERT Questions
8th Chapter 13 Light
NCERT Books for Session 2022-2023
CBSE Board and State Board
Questions No: 2
Description:
The laws of reflection dictate that light hitting a surface reflects at an angle equal to its angle of incidence. These laws also affirm that incident light, reflected light, and the surface normal lie in the same plane. These principles govern light behavior on reflective surfaces, essential in optics.
Regular reflection and diffused reflection are distinct forms of light reflection:
1. Regular Reflection: This occurs on smooth and polished surfaces like mirrors or still water. Incident light rays strike uniformly, reflecting in an organized manner according to the laws of reflection. Reflected rays maintain specific angles relative to the normal, producing sharp, well-defined images.
2. Diffused Reflection: Happening on uneven or rough surfaces like paper, cardboard, or walls, diffused reflection arises due to surface imperfections. Incident light scatters upon reflection, diverging in various directions. Reflected rays scatter randomly, creating uniform surface illumination without forming clear images.
The laws of reflection—such as angle of incidence equals angle of reflection and the incident, reflected rays, and normal lying in the same plane—apply to both regular and diffused reflection. Despite the seemingly random scattering in diffused reflection, these laws hold true.
Regular reflection arises from smooth surfaces, producing organized reflections, while diffused reflection occurs on rough surfaces, resulting in scattered and non-distinct reflections. Despite the scattered appearance, diffused reflection still adheres to the laws of reflection, showcasing light scattering due to surface irregularities rather than contradicting the fundamental laws.