1. What is reflection? 2. What is refraction? 3. How is a mirror similar to lens? How are they different?
Answer (1)
1. Reflection:Reflection occurs when light bounces back from a surface, retaining its original direction and speed. The angle of incidence equals the angle of reflection. Examples:Mirror reflectionWater reflectionEchoes (sound reflection)2. Refraction:Refraction occurs when light passes through a medium with a different optical density, changing direction and speed. Examples:Water-glass interfacePrism dispersionLens focusingSimilarities between Mirrors and Lenses:1. Both manipulate light.2. Both can produce images.3. Both rely on optical principles.Differences between Mirrors and Lenses:Mirrors:1. Reflect light.2. Form virtual images (behind mirror).3. No refraction occurs.4. Flat or curved surfaces.Lenses:1. Refract light.2. Form real or virtual images (depending on type).3. Can converge or diverge light.4. Curved surfaces (convex or concave).Key lens types:- Convex lens: converges light- Concave lens: diverges light
