# constructive interference Definition and Topics - 6 Discussions

In physics, interference is a phenomenon in which two waves superpose to form a resultant wave of greater, lower, or the same amplitude. Constructive and destructive interference result from the interaction of waves that are correlated or coherent with each other, either because they come from the same source or because they have the same or nearly the same frequency. Interference effects can be observed with all types of waves, for example, light, radio, acoustic, surface water waves, gravity waves, or matter waves. The resulting images or graphs are called interferograms.

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### Newton's Rings and Thin Film Interference

Homework Statement A total of 31 bright and 31 dark Newton's rings (not counting the dark spot at the center) are observed when 550-nm light falls normally on a planoconvex lens resting on a flat glass surface. How much thicker is the center than the edges? Homework Equations 2t = mλ 2t =...
2. A

### Diffraction Grating and White Light Problem

Homework Statement White light containing wavelengths from 400 nm to 750 nm falls on a grating with 6000 lines/cm. How wide is the first-order spectrum on a screen 2.0 meters away Homework Equations dsinθ=mλ for constructive interference dsinθ=(m+1/2)λ for destructive interference Δx = λL/d...
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### ASOE Physics Exam Q - Diagram for Constructive Interference

1. The problem statement, all variables, and given/known data So I am studying for the ASOE physics test. I came across the following question where I can't really understand the answer to it: The actual answer is: http://prntscr.com/fum35c Could someone help me and explain what they are...
4. ### Coating Eyeglass Lenses(destructive interference)

Homework Statement Eyeglass lenses can be coated on the inner surfaces to reduce the reflection of stray light to the eye. If the lenses are medium flint glass of refractive index 1.62 and the coating is fluorite of refractive index 1.432, (a) what minimum thickness of film is needed on the...
5. ### Light (Constructive/Destructive Interference)

Homework Statement This is not a homework question but I would like if someone could explain to me when to consider what equation constructive/destructive? I learned these two equations very vaguely in class: dsinθ = mλ or d(ym)/L=mλ dsinθ = (m+1/2)λ or d(ym)/L = (m+1/2)λ The power point...
6. ### Question on destructive and constructive interference

Homework Statement Two speakers A and B are 3.50m apart and each one is emitting a frequency of 444Hz. However because of signal delays, speaker A is 1/4 of a period ahead of B. Find all points relative to the centerline between A and B where there is constructive interference. Include angles...