Match List-I with List-II
| List-I | List-II |
| Observation | Light related phenomenon |
| (A) Blue colour of sky | (I) Dispersion |
| (B) Seven colours obtained from Prism | (II) Refraction |
| (C) Bending of pencil dipped in water | (III) Scattering |
| (D) Alternate bright and dark bands of equal thickness | (IV) Interference |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (A) - (III), (B) - (I), (C) - (II), (D) - (IV)
Each observation is the signature of one behaviour of light: change of direction at a boundary, separation of colours, redirection by small particles, or superposition of waves.
(A) Blue colour of sky — this matches (III) Scattering. Air molecules scatter short wavelengths much more strongly (Rayleigh scattering, proportional to \( 1/\lambda^{4} \)), so scattered blue light reaches the eye from all over the sky.
(B) Seven colours obtained from Prism — this matches (I) Dispersion. The refractive index of glass differs for each wavelength, so the colours of white light bend by different amounts and separate.
(C) Bending of pencil dipped in water — this matches (II) Refraction. Light from the dipped part bends as it leaves water for air, so that part appears raised and the pencil looks bent.
(D) Alternate bright and dark bands of equal thickness — this matches (IV) Interference. Equally spaced fringes of width \( \lambda D/d \) are produced by the superposition of waves from two coherent sources.