Question 14
In the List-I, four optical effects are mentioned. The physical phenomena of light which are essential to describe these optical effects are given in List-II. Choose the option which describes the correct match between the entries in List-I to those in List-II.
List - I
Colorful sky in north polar region (Aurora Borealis)
Partially polarized sun light
Rainbow
Dark and bright fringes
List-II
Dispersion and reflection
Total internal reflection
Diffraction
Scattering of light by molecules in the atmosphere
Emission of radiation from oxygen and nitrogen atoms excited by charged particles
P-5, Q-4, R-1, S-3
P-4, Q-2, R-1, S-3
P-4, Q-1, R-2, S-3
P-5, Q-4, R-1, S-2
Detailed Solution
P matches 5: Aurora Borealis is caused by the emission of light from oxygen and nitrogen atoms in the upper atmosphere when they are excited by charged particles (solar wind).
Q matches 4: Sun light becomes partially polarized due to scattering by air molecules in the atmosphere (Rayleigh scattering).
R matches 1: A rainbow is primarily described by the dispersion of light as it refracts into and out of water droplets, combined with internal reflection.
S matches 3: Dark and bright fringes are a characteristic result of interference or diffraction patterns.
Therefore, the correct matching is P 5, Q 4, R 1, S 3.
Correct Option: A
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