Physics
Grade-10
Easy
Question
The white light can be obtained back from the spectrum generated when it is passed through a prism, by ______.
- Inverting the prism used to generate the spectrum
- Placing a second prism in the path of the spectrum in an upright manner
- Placing a second prism in the path of the spectrum in an inverted manner
- Rotating a second prism by placing it in the path of the spectrum
Hint:
Angle of deflections in two inverted prisms is equal and opposite
The correct answer is: Placing a second prism in the path of the spectrum in an inverted manner
One erect prism will refract and disperse the light while the inverted one will do the same and produce white light again
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