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# Abbe Equation Calculator Online

The Abbe Equation Calculator helps you find the focal length of a lens. By entering the refractive indices and the radii of curvature for the lens surfaces, the calculator gives you the focal length. This is important for ensuring the lens works as expected.

## Formula of Abbe Equation Calculator

The Abbe equation is used to find the focal length of a lens. The formula is:

Where:

• f is the focal length of the lens
• n1 is the refractive index of the medium before the lens (usually air, n1 is about 1)
• n2 is the refractive index of the lens material
• R1 is the radius of curvature of the lens surface closest to the light source
• R2 is the radius of curvature of the lens surface farthest from the light source
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This formula can be used to calculate the focal length of a lens given the necessary parameters.

## Common Terms Table

Below is a table of pre-calculated values for common terms used in the Abbe equation. This can help for quick reference without recalculating each time.

## Example of Abbe Equation Calculator

Let’s calculate the focal length of a lens made of glass (refractive index n2 = 1.5) with the following parameters:

• R1 = 10 cm
• R2 = -10 cm
• n1 = 1 (air)
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Using the formula:

1/f = (1.5 – 1) / 1 * (1 / 10 – 1 / -10)

1/f = 0.5 * (0.1 + 0.1) = 0.5 * 0.2 = 0.1

So, f = 10 cm. The focal length of this lens is 10 cm.

## Most Common FAQs

Q1: Why is the refractive index important in the Abbe equation?

The refractive index determines how much light bends when entering a lens. This bending is important for focusing light correctly, which is why it is a key part of the Abbe equation.

Q3: Can the Abbe equation be use for all types of lenses?

The Abbe equation is mainly use for simple lenses with spherical surfaces. For more complex lens systems, additional calculations and considerations are needed.