A thin beam of white light falls on a face of a glass prism and a spectrum is obtained on a screen. Which of…

Question

A thin beam of white light falls on a face of a glass prism and a spectrum is obtained on a screen. Which of the following options is the correct sequence of colours from top to bottom on the screen ?

Accepted Answer

## Model Answer **(B) Red, Yellow, Green, Blue, Violet** The correct sequence from top to bottom is: **Red, Yellow, Green, Blue, Violet** — since violet bends the most and red bends the least while passing through the prism. Source: Chapter 10, Section 10.4 – Dispersion of White Light by a Glass Prism --- ## Explanation The full spectrum is VIBGYOR (Violet, Indigo, Blue, Green, Yellow, Orange, Red). Violet deviates the most, so it appears at the bottom; Red deviates the least, so it appears at the top. Option (B) follows this order (a condensed ROYGBV sequence), making it correct. Students often confuse top/bottom — remember: least deviation = top (Red), most deviation = bottom (Violet).

Science — CBSE Class 10 board question