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

In summary, when a convex lens is placed on a flat glass plate and illuminated with monochromatic red light, concentric bands of red and dark are observed. At the exact center of the lens, where the lens and glass plate are in direct contact, there is a thin layer of air between the surfaces which causes light to reflect at the glass/air boundaries. The first reflection occurs at the lens/air boundary and the second at the air/plate boundary, resulting in interference between the two reflections. The phase difference between these reflections may be considered to determine the observed patterns. However, further information is needed to fully understand the phenomenon.
  • #1
skrewd1
5
0
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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  • #2
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?)
 
  • #3
bump
Still can't figure out :mad:
 
  • #4
What have you done so far? What can you say about the two reflections?
 

1. What is the purpose of placing a convex lens and glass plate at the center?

The convex lens and glass plate are placed at the center to observe and study the behavior of light as it passes through different mediums. This setup allows scientists to investigate how the lens and plate affect the path of light and how they interact with each other.

2. What is observed when light passes through the center of a convex lens and glass plate?

When light passes through the center of a convex lens and glass plate, it is observed that the light is bent or refracted. This is due to the difference in the density of the medium, causing the light to change direction as it passes through.

3. How does the shape of the lens and plate affect the behavior of light?

The convex shape of the lens and plate causes the light to converge or focus at a certain point. This is known as the focal point, and it occurs because the outer edges of the lens and plate are thicker than the center, causing the light to bend towards the center.

4. What is the difference between convex and concave lenses?

Convex lenses are thicker at the center and thinner at the edges, causing light to converge and focus. On the other hand, concave lenses are thinner at the center and thicker at the edges, causing light to diverge and spread out.

5. How is the behavior of light through a convex lens and glass plate related to everyday objects?

The behavior of light through a convex lens and glass plate is related to everyday objects such as magnifying glasses, reading glasses, and camera lenses. These objects use the principles of light refraction through a convex lens to magnify or focus the image being viewed.

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