How to find critical angle using n?

To find the critical angle, you need to know the refractive indices of the two mediums involved. The critical angle can be determined using the formula:

sin(critical angle) = 1 / refractive index (n)

To find the critical angle using the refractive index (n), follow these steps:

1. Determine the refractive index of the medium in which the light is traveling initially (usually air), which is approximately 1.00.

2. Determine the refractive index of the other medium (e.g., water, glass, etc.) by looking it up in a reference table or using specific experimental data.

3. Take the reciprocal of the refractive index of the second medium (1 / n) to obtain the value to be used in the formula.

4. Use the inverse sine function (sin^-1) to find the critical angle. If you're using a calculator, make sure it is set to the correct angle unit (degrees or radians).

For example, if the refractive index of the second medium is 1.33, then the calculation would be:

sin(critical angle) = 1 / 1.33

critical angle = sin^-1(1 / 1.33)

The resulting value will be the critical angle in radians or degrees, depending on the setting of your calculator.

Remember that the critical angle only applies when light is passing from a medium with a higher refractive index to one with a lower refractive index.