# Frequent question: What is the refractive index of convex lens?

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## How do you find the refractive index of a convex lens?

1/f = (n − 1)( 1/R1 − 1/R2 + (n − 1)d/(n R1 R2)), where f is the focal length of the lens, R1 is the radius of the first surface, R2 is the radius of the second surface, and n is the refractive index of the lens. To use this equation to find the refractive index, you need to determine f, R1, and R2.

## What is the refractive index of concave lens?

The refractive index of the material of a concave lens is μ . It is immersed in a medium of refractive index μ1. .

## How do you calculate the refractive index of a lens?

Refractive index is also equal to the velocity of light c of a given wavelength in empty space divided by its velocity v in a substance, or n = c/v.

## What are the two types of refractive index?

Relative refractive index: When light travels from one medium to another medium, then the refractive index is known as the relative refractive index. Absolute refractive index: When light travels from vacuum to another medium, then the refractive index is known as the absolute refractive index.

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## What is refractive index in simple words?

Refractive Index (Index of Refraction) is a value calculated from the ratio of the speed of light in a vacuum to that in a second medium of greater density. The refractive index variable is most commonly symbolized by the letter n or n’ in descriptive text and mathematical equations.

## What is the refractive index for air?

Some representative refractive indices

Name of Material λ (nm) refractive index no. n
Air 589.29 1.000293
Carbon dioxide 589.29 1.00045
Helium 589.29 1.000036
Hydrogen 589.29 1.000132

## What is relative refractive index?

The ratio of the speed of light in a vacuum to the speed of monochromatic light in the substance of interest. … That ratio should be called a relative refractive index. The ratio of the first value to the second one is about the relative refractive index of the glass.

## What is the relation between power and refractive index?

Relationship between the power of a convex lens and the refractive index of a medium. Apparently, focal length f is inversely proportional to the refractive index of the medium μ. Since, Optical Power P=1f. This should imply that optical power is directly proportional to the refractive index.

## Can we find refractive index using concave lens?

Among all those different methods, the spherical concave mirror filled with a liquid makes itself an excellent alternative to measure the refractive index of the liquid, specially when no fancy apparatuses are available, and the accuracy of the measurements is not critical.

## Which lens is used in Zone Plate?

It is a transparent plate on which circles whose radii, proportional to the square roots of natural numbers 1, 2, 3… are drawn. The alternate annular zones thus formed are blocked. Such a plate behaves like a convex lens and produces an image of a source of light on the screen placed at a suitable distance.

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