Match List I with List II
| LIST I | LIST II | ||
| A. | Frequency is the characteristics of | I. | Due to dispersion of light |
| B. | In a soap bubble colours are seen | II. | Medium of travel of light |
| C. | Wavelength depends on | III. | Source of light |
| D. | In a prism colours appear | IV. | Due to interference of light |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → A-III, B-IV, C-II, D-I
When light passes from one medium to another, its frequency stays the same while its speed and wavelength change, since \( v = \nu\lambda \). Colours can be produced either by interference or by dispersion.
(A) Frequency is the characteristics of — this matches (III) Source of light. The frequency is fixed by the source that emits the light and does not change on refraction.
(B) In a soap bubble colours are seen — this matches (IV) Due to interference of light. Light reflected from the two surfaces of the thin film interferes, and different thicknesses reinforce different colours.
(C) Wavelength depends on — this matches (II) Medium of travel of light. With the frequency fixed, \( \lambda = v/\nu \), and the speed \( v = c/\mu \) depends on the medium.
(D) In a prism colours appear — this matches (I) Due to dispersion of light. The refractive index of glass is different for different colours, so each colour is deviated by a different angle.