Why does the Sun appear reddish at sunrise and sunset?
Answer framework: Explain long atmospheric path, scattering of shorter wavelengths and survival of red light.
All Class 10 Science notes
Chapter 10 • Physics
The Human Eye and the Colourful World
Explain eye structure, accommodation, vision defects and corrections, refraction through a prism, dispersion and atmospheric optical effects.
Core concepts checklist
Human eye and accommodation
Myopia, hypermetropia and presbyopia
Correction using lenses
Dispersion and spectrum
Atmospheric refraction and scattering
Formula & fact bank
P = 1/f(m)
Myopia → concave lens
Hypermetropia → convex lens
Scattering intensity ∝ 1/λ⁴ (qualitative use)
Diagrams to practise
Draw with pencil, use straight label lines, add arrows and write a precise caption.
- 1Human eye
- 2Myopia and correction
- 3Hypermetropia and correction
- 4Prism dispersion
CBSE examiner focus
- State where the image forms before naming the defect
- Link blue sky and red sunset to wavelength-dependent scattering
- Distinguish dispersion from scattering
Board-style practice
Explain myopia and hypermetropia with correction diagrams.
Answer framework: For each: symptom, cause, image location and correct lens with labelled rays.
Turn revision into marks with Eduvista
Use this guide for recall, then practise timed answers and get feedback. Eduvista combines visual notes, NCERT clarity, board-pattern tests and personal doubt support.