Node 4- Prisms, Dispersion:

What is a prism?

A wedge shaped piece of glass and it can be used to alter the apparent location of an object.

Where you would use optometry?

When there isn’t allignment of images in both eyes.

A prism in a lens helps displace the viewed image, toward a direction to being the image into binocular sync.

Used to treat muscular imbalance, that causss double vision.

What is the amount of displacement upon?

The amount of displacement is dependent on the size of the angle of the apex, the greater the angle the thicker the prism will be.

Thicker prisms:

Thicker prisms equate to a stronger amount of correction and displace objects to a greater degree.

Thinner prisms:

Thinner prism have a weaker amount of correction and displace objects to a lesser degree.

Dispersion definition

Dispersion is the separation of electromagnetic radiation into constituents of different wavelengths.

White light and how it displays dispersion?

White light is made up of different wavelengths of light, when passed through a prism it will split into its constituent colours.

Why is blue light refracted by red light more?

Blue light has a shorter wavelength, so interacts with atoms in material more, leading to greater refraction.