At Center of Convex Lens & Glass Plate: What is Observed?

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Homework Help Overview

The problem involves observing the effects of light interference when a convex lens is placed on a flat glass plate, specifically focusing on the observations made at the center of the lens under monochromatic red light illumination.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the presence of a thin air layer between the lens and the glass plate and its impact on light reflections and interference patterns. Questions are raised regarding the phase difference between the reflections occurring at the boundaries.

Discussion Status

The discussion is ongoing, with some participants seeking clarification on the nature of the reflections and their implications for the observed interference patterns. There is an indication of uncertainty and a request for further input on the topic.

Contextual Notes

Participants are considering the effects of light reflection and interference, particularly focusing on the phase differences involved, while also expressing challenges in understanding the observations made.

skrewd1
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A convex lens is placed on a flat glass plate and illuminated from above with monochromatic red light. When viewed from above, concentric bans of red and dark are observed. What does one observe at the exact center of the lens where the lens and the glass plate are in direct contact.
 
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There is a thin layer of air between the surfaces, thus light reflects at the glass/air boundaries. The first reflection is at the lens/air boundary, the second at the air/plate boundary. Consider the interference between these two reflections. (What is their phase difference?)
 
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Still can't figure out :mad:
 
What have you done so far? What can you say about the two reflections?
 

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