Science — CBSE Class 10 board question

Scattering of Light: When light falls on fine particles (like dust, smoke, or air molecules), it is redirected in different directions. This phenomenon is called scattering of light. The colour of scattered light depends on the size of the particles; fine particles scatter blue light more strongly.

Difference from Reflection:

| Scattering | Reflection |
|---|---|
| Light is redirected in all directions by tiny particles | Light bounces back in a definite direction from a smooth surface |
| Occurs due to particles of various sizes (dust, molecules) | Occurs at a polished/smooth surface like a mirror |
| Does not follow strict laws | Follows the two laws of reflection strictly |

Source: Chapter 10, Section 10.6 Scattering of Light; Chapter 9, Section 9.1 Reflection of Light

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• Examiners expect a definition of scattering followed by a clear comparison with reflection — either as a table or as labelled points.
• Key contrast: scattering = multidirectional, caused by particles; reflection = directional, caused by smooth surfaces following fixed laws.
• Mentioning the Tyndall effect or examples (blue sky, sunlight through smoke) can earn you extra credit but is not strictly required for 3 marks.
• Do not confuse scattering with diffuse reflection — scattering involves particles in a medium, not a rough surface.