Question

A plane glass slab is kept over various coloured letters. The letter which appears least raised is

• A. Violet
• B. Blue
• C. Green
• D. Red

Answer 1

The correct option is D

Red

1. The refractive index of the medium is inversely proportional to the wavelength of the incident ray.
2. Red color has a maximum wavelength and thus, the refractive index of the glass will be minimum for the red color. Therefore red letter will be least raised.
3. Thus, the correct option is (D).