Question Detail

PHY 104 Diffraction and Interference of light waves Objective Question
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Question

What defines the 'nth order bright fringe' in a diffraction grating pattern?
Options
A The fringe where diffracted rays from each slit differ by n/2 wavelengths.
B The fringe where the deviation angle is n degrees.
C The fringe where diffracted rays from each slit differ by an amount equal to n wavelengths.
Correct Answer
D The fringe that is n times brighter than the central fringe.
Correct Answer

Option C is the correct answer.

Detailed Explanation

Page 6 explains, 'The first-order fringe occurs when n=1. This image occurs when the paths of diffracted rays from each slit differ by an amount equal to one wavelength. The second-order spectrum occurs when the paths differ by two wavelengths.' This generalizes to 'n' wavelengths for the 'nth' order.

Hint

Consider the relationship between path difference and the order number 'n' for constructive interference.

Question Info

Course: PHY 104
Topic: Diffraction and Interference of light waves
Type: Objective
Difficulty: Not specified
Question 529 of 947
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