# What is the refractive index GCSE?

## What is the refractive index GCSE?

We know the speed at which a wave travels is dependant upon the medium it travels through. A number called the refractive index of a substance is a measure of how much the speed of a wave changes compared to the speed in a reference medium i.e. air or a vacuum.

## How do you calculate refractive index BBC Bitesize?

Calculate the refractive index.

- Work out the sine of angle i. sin 55 = 0.819.
- Work out the sine of angle r. sin 33 = 0.545.
- Divide sin i by sin r. refractive index = sin i ÷ sin r. refractive index = 0.819 ÷ 0.545 = 1.50. A practical demonstration of how Pyrex seems to disappear in vegetable oil. Page 4 of 4. Glossary.

**What is refraction Igcse?**

Refraction occurs when light passes a boundary between two different transparent media. At the boundary, the rays of light undergo a change in direction. The direction is taken as the angle from a hypothetical line called the normal.

### How do you find a refractive angle?

The angle made by the ray of light in the air to that of the reference light (the normal), is the angle of incidence, and the angle made by the ray of light in the glass to the same normal, is the angle of refraction. It is the ratio of the sines of both these angles that is the refractive index of the block of glass.

### What is refractive index Igcse physics?

The refractive index is a number that is always larger than 1 and is different for different materials. Objects which are more optically dense have a higher refractive index, eg. n is about 2.4 for diamond. Objects which are less optically dense have a lower refractive index, eg. n is about 1.5 for glass.

**How to calculate the refractive index of an angle?**

Calculate the refractive index. Step 1. Work out the sine of angle i. sin 55 = 0.819 . Step 2. Work out the sine of angle r. sin 33 = 0.545 . Step 3. Divide sin i by sin r. refractive index = sin…

#### Which is a medium with a higher refractive index?

Optically denser medium is a medium, which has a higher value of the refractive index. This means the speed of the light is slow in the optically denser medium in comparison to an optically rarer medium. The refractive index also determines how much the light changes its path when it travels from one medium to another medium.

#### How is the refractive index of a vacuum determined?

As mentioned before, to calculate the refractive index, two different mediums are considered. But, when one of the two mediums is considered a vacuum, then the refractive index of the second medium, concerning the first medium, is known as Absolute Refractive Index. The symbol n₂ denotes the absolute Refractive Index.

**How is the speed of light affected by refraction?**

Light changes speed as it passes from one medium to another. This is called refraction. The frequency of light does not change as it refracts. The refractive index of a material is a measure of the change in the speed of light as it passes from a vacuum (or air as an approximation) into the material.