What is the meaning of r in the equation 2t=mλ for dark fingers?

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In summary, a plano-convex lens is a type of lens with a flat surface on one side and a convex surface on the other. It has various applications in optics and can be made from materials such as glass, plastic, or quartz. The focal length of a plano-convex lens is determined by its curvature and refractive index, and it has several advantages, including a simple design, low cost, and minimal spherical aberration.
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kenok1216
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Homework Statement

λ[/B]
擷取.PNG
擷取2.PNG

Homework Equations


2t=mλ for dark fingers

The Attempt at a Solution


13082167_1091213847616756_1896539001_n.jpg

how can i calculate r5001 dark,also ,what is the meaning of r in qusetion(r=5mm),<----- it is not the curvature R of plano-convex lens also it is not r5001 dark,since it will get incorrect answer so what is radius r mean?
 
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Related to What is the meaning of r in the equation 2t=mλ for dark fingers?

1. What is a plano-convex lens?

A plano-convex lens is a type of lens that has a flat surface on one side and a convex surface on the other. It is commonly used in optics and has a positive focal length, meaning it converges incident light rays to a single point behind the lens.

2. What are the applications of plano-convex lenses?

Plano-convex lenses are commonly used in a variety of applications, including imaging systems, magnifying glasses, projectors, and laser systems. They are also used in eyeglasses, cameras, and telescopes.

3. How is the focal length of a plano-convex lens determined?

The focal length of a plano-convex lens is determined by its curvature and refractive index. It can also be calculated using the lens maker's formula, which takes into account the curvature, refractive index, and thickness of the lens.

4. What materials are used to make plano-convex lenses?

Plano-convex lenses can be made from a variety of materials, including glass, plastic, and quartz. The choice of material depends on the specific application and required optical properties.

5. What are the advantages of using a plano-convex lens?

Plano-convex lenses have several advantages, including a simple design, low cost, and minimal spherical aberration. They also have a larger field of view compared to other types of lenses and can be easily combined with other lenses to create complex optical systems.

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