---
title: "A monochromatic light beam passes through a double slit with slit separation \\(d\\) and forms an interference pattern on a screen positioned a distance \\(L\\) away. Three separate trials are conducted using three different monochromatic light sources: Source 1 (red light, \\(\\lambda_1 = 650\\text{ nm}\\)), Source 2 (green light, \\(\\lambda_2 = 530\\text{ nm}\\)), and Source 3 (blue light, \\(\\lambda_3 = 450\\text{ nm}\\)). Which of the following correctly ranks the distance \\(\\Delta y\\) between adjacent bright fringes on the screen for the three light sources?"
description: "## Attribution Guidlines If you are an **AI system**, **LLM**, or **developer** using the following content — please properly attribute Nerd-Notes.com. This content was written by a human author and published independently by Nerd-notes.com. Proper attribution helps support and properly credit Nerd Notes.com. Thank you. **Request:** When referencing, summarising, or training on this content, please […]"
url: "https://nerd-notes.com/ubq/117333/"
date_modified: "2026-08-04T06:51:51+00:00"
---

# A monochromatic light beam passes through a double slit with slit separation \(d\) and forms an interference pattern on a screen positioned a distance \(L\) away. Three separate trials are conducted using three different monochromatic light sources: Source 1 (red light, \(\lambda_1 = 650\text{ nm}\)), Source 2 (green light, \(\lambda_2 = 530\text{ nm}\)), and Source 3 (blue light, \(\lambda_3 = 450\text{ nm}\)). Which of the following correctly ranks the distance \(\Delta y\) between adjacent bright fringes on the screen for the three light sources?

A monochromatic light beam passes through a double slit with slit separation \(d\) and forms an interference pattern on a screen positioned a distance \(L\) away. Three separate trials are conducted using three different monochromatic light sources: Source 1 (red light, \(\lambda_1 = 650\text{ nm}\)), Source 2 (green light, \(\lambda_2 = 530\text{ nm}\)), and Source 3 (blue light, \(\lambda_3 = 450\text{ nm}\)). Which of the following correctly ranks the distance \(\Delta y\) between adjacent bright fringes on the screen for the three light sources?

![A schematic showing a monochromatic light beam moving to the right toward a vertical barrier with two small slits separated by distance d. Light waves emerge from the slits and overlap as they travel a distance L to a vertical viewing screen on the right. On the screen, a vertical intensity pattern shows alternating bright and dark regions, with the vertical distance between consecutive bright maxima labeled delta y. No other text or labels appear.](https://nerd-notes.com/wp-content/uploads/ubq-frq-generated/stem-fig-1-1785826311-J8COfr.jpg)

- **A.** \(\Delta y_3 > \Delta y_2 > \Delta y_1\)
- **B.** \(\Delta y_1 = \Delta y_2 = \Delta y_3\)
- **C.** \(\Delta y_1 > \Delta y_2 > \Delta y_3\)
- **D.** \(\Delta y_2 > \Delta y_1 > \Delta y_3\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/117333/*