Dispersion of light is the phenomenon in which white light splits into its constituent colours when it passes through a transparent medium like a prism.
White light is a mixture of different colours. Each colour has a different wavelength.
The band of colours obtained due to dispersion of white light is called a spectrum.
The seven colours obtained are:
(Mnemonic: VIBGYOR)
Dispersion occurs because different colours of light travel with different speeds in a medium.
Q1. Dispersion of light is the phenomenon of: A) Reflection of light B) Refraction of light C) Splitting of white light into colours D) Bending of light only Answer: C Q2. The band of colours obtained due to dispersion is called: A) Image B) Ray C) Spectrum D) Beam Answer: C Q3. Which of the following shows dispersion of light? A) Plane mirror B) Glass slab C) Prism D) Lens Answer: C Q4. The correct order of colours in spectrum is: A) RYGBIVO B) VIBGYOR C) RGBVIOY D) YORGBIV Answer: B Q5. Dispersion occurs because: A) Light travels in straight line B) All colours have same speed C) Different colours have different speeds D) Light reflects inside prism Answer: C
Splitting of white light into its constituent colours.
Band of colours obtained after dispersion.
VIBGYOR
Different colours travel with different speeds in a medium.
Direct MCQs are asked on definition, spectrum and order of colours.
