Light

Science Class 8 : Chapter 16

Now Playing: Ambient Study

Quick Revision : Light

  • What makes things visible: Light enters our eyes from objects either emitted or reflected by them.
  • Laws of Reflection: 1) Angle of incidence = Angle of reflection. 2) Incident ray, reflected ray, and normal all lie in same plane.
  • Regular Reflection: From smooth surfaces (mirrors) - parallel rays remain parallel after reflection.
  • Diffused/Irregular Reflection: From rough surfaces - rays scatter in different directions.
  • Image Formation: Plane mirrors form virtual, erect, same-size images with lateral inversion.
  • Multiple Images: Two mirrors at angles produce multiple images (kaleidoscope principle).
  • Dispersion: Splitting of white light into seven colors (VIBGYOR).
  • Human Eye: Cornea, iris, pupil, lens, retina, optic nerve. Rods for dim light, cones for color.
  • Blind Spot: Point on retina with no sensory cells where optic nerve exits.
  • Braille System: Reading and writing system for visually challenged using raised dot patterns.

Questions

Chapter Summary : Light

What You Will Learn: This chapter covers the nature of light, reflection, laws of reflection, types of reflection, image formation in plane mirrors, multiple images, dispersion of light, structure and working of human eye, common eye defects, and Braille system for visually challenged persons.

How This Website Helps: Provides graded MCQs from basic to advanced levels with detailed explanations to strengthen conceptual understanding and prepare for exams.

PhysicsExamsPrep.com - Practice, Prepare and Success