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# Will dispersion occur if a polychromatic ray of light enters a prism at an angle of incidence of 90 degree from air to denser medium?

Updated: 8/20/2019

Wiki User

10y ago

Dispersion will occur, in the sense that the phase velocity of the different wavelengths will be different.

What you may be asking is whether refraction (a change in the direction of the light) will occur. Refraction will only be visible if the light impacts at an oblique angle, not 90 degrees.

Wiki User

10y ago
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Q: Will dispersion occur if a polychromatic ray of light enters a prism at an angle of incidence of 90 degree from air to denser medium?
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### How do light refract?

when light travels from rarer medium(which has relatively lower density) to a denser medium(which is of relatively higher density) the angle of incident light and refracted light is less than 180 degree(when the angle is considered at the point of incidence) and when the light travels from a denser to a rarer medium the angle will be greater than 180 degree.

### What are the conditions for total internal reflection to take place?

Light must travel from the optically denser medium to the optically less dense one. For total internal reflection to occur, the angle of incidence in the optically denser medium must be greater than the critical angle of that medium. The critical angle is that angle of incidence in the optically denser medium for which the angle of refraction is 90o.

### On what factors does deviation produced by a prism depend?

angle between two edges and angle of incidence how denser the object is

### Is the angle of incidence is greater than the angle of refraction when light passes from a less dense to denser medium?

If you meant optical density by the term 'denser ' Then the answer is.... The light bends towards normal when it travels from a optically less dense medium to optically dense medium. So angle of incidence is greater than the angle of refraction

### What happens to waves when they enter a denser medium at a angle?

They are refracted, and the new angle of travel appears as an increase to the initial angle of incidence.

### What are characteristics of refraction?

1. When a ray of light travels obliquely from an optically rarer medium to an optically denser medium,it bends towards the normal at the point of incidence. in this case,angle of incidence is greater than the angle of refraction...

### What is total internal refraction?

When the angle of incidence is greater than the critical angle,the light ray reflects into denser medium at interface. This is total internal refraction

### What two mediums have to be present for total internal reflection?

Any two media having different optical densities is necessary. The conditions for total internal reflection are: 1. Light must travel from the optically denser medium to the optically less dense one. 2. The angle of incidence is greater than the critical angle, which is the angle of incidence in the optically denser medium for which the angle of refraction is 90o.

### What happens to the light ray when the angle of incidence is greater than the angle of total reflection?

it is not the angle of total reflection, it is the critical angle. and when the angle of incidence is greater than the critical angle, total internal reflection takes place and as it is necessary for total internal reflection to take place that the ray must travel from denser to rarer medium so, when it occurs, the ray is reflected bach into the denser medium.

### Does the speed of light changes when it goes from rarer medium to denser medium having angle of incidence equal to 0?

The speed of light changes when it goes from one medium to another one with a different index of refraction. The angle of incidence doesn't influence the change in speed.

### The point at which light rays meet?

A normal line is the name of the line drawn perpendicular to the surface where a light ray strikes.

### Why the ray of light does not bend when it passes perpendicularly from rarer medium to denser medium?

Since the angle of incidence is 0, there is no chance of refraction and so the angle of refraction too becomes 0.