Physics
What is a prism? With the help of a diagram of the principal section of a prism, indicate its refracting surfaces, refracting angle and base.
Refraction Plane Surfaces
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Answer
A prism is defined as a transparent medium bounded by five plane surfaces with a triangular cross section. The below diagram shows the principal section of a prism with its refracting surfaces, refracting angle and base labelled:
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Related Questions
A light ray of yellow colour is incident on an equilateral glass prism at an angle of incidence equal to 48° and suffers minimum deviation by an angle of 36°.
(i) What will be the angle of emergence?
(ii) If the angle of incidence is changed to (a) 30°, (b) 60°, state in each case whether the angle of deviation will be equal to less than or more than 36°?
How does the angle of deviation depend on refracting angle of the prism?
The diagrams (a) and (b) in figure below show the refraction of a ray of light of single colour through a prism and a parallel sided glass slab, respectively.
(a)
(b)
(i) In each diagram, label the incident, refracted, emergent rays and the angle of deviation.
(ii) In what way the direction of the emergent ray in the two cases differ with respect to the incident ray? Explain your answer.
What do you understand by the deviation produced by a prism? Why is it caused? State three factors on which the angle of deviation depends.