Question

Which colour of white light bends the least after passing through a prism?

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

Hint:

Bending is inversely proportional to wavelength: shorter wavelength → more bending, longer wavelength → less bending.

Answer 1

The Correct Option is B

Step 1: Concept of Dispersion:
When white light passes through a prism, different colours bend by different amounts because each wavelength has a different refractive index in glass. Step 2: Bending Order:
Violet: Has the shortest wavelength, highest frequency, and bends the most.
Red: Has the longest wavelength, lowest frequency, and bends the least.
Step 3: Example:
This is why in a rainbow, red appears at the top (least deviation) and violet at the bottom (most deviation).
Step 4: Final Answer:
The colour that bends the least through a prism is Red.