Which one of the following figures correctly shows the path of a ray of light through a glass prism:?
CONCEPT:
- Refraction through a prism : It is the bending of light when it goes from one medium to another.
- When a ray of light passes through a glass prism, refraction of light occurs both, when it enters the prism as well as when it leaves the prism.
- Prism : It is a wedge-shaped transparent body that causes incident light to be separated by color upon exiting.
- Since "white" light is really a superposition of different wavelengths, the prism, therefore, has the effect of angularly separating the incident light by color.
Formula:
⇒ Angle of prism (A) = r 1 + r 2
where r 1 = Angle of refraction at phase one, r 2 = Angle of refraction at phase two.
EXPLANATION :
- When a ray of light passes through a prism, it undergoes refraction two times .
- The first time when a ray of light passes from rarer to the denser medium of glass , it bends towards normal which is towards the base of the prism.
- The second time the ray of light passed from denser to rarer medium, i.e., glass to air, and it bends away from the normal , i.e., towards the base of the prism and it is happening only in the first case. Therefore option 1 is correct.
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