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प्रश्न
A monochromatic ray of light is incident on an equilateral prism placed at minimum deviation position with an angle of incidence 45° as shown in the diagram?
- Copy the diagram and complete the path of the ray PQ.
- State two factors on which the angle of deviation depends.
उत्तर
- Factors on which the angle of deviation depends are:
- Angle of incidence (i).
- Material of the prism (μ).
- Angle of the prism.
- the colour or wavelength (λ) of light used.
- refractive index.
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संबंधित प्रश्न
Write a relation for the angle of deviation (δ) for a ray of light passing through an equilateral prism in terms of the angle of incidence (i1) angle of emergence (i2) and angle of the prism (A).
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.
- In each diagram, label the incident, refracted, emergent rays and the angle of deviation.
- In what way the direction of emergent ray in the two cases differ with respect to the incident ray? Explain your answer.
A ray of light incident at an angle of incidence i1 passes through an equilateral glass prism such that the refracted ray inside the prism is parallel to its base and emerges at an angle of emergence i2.
- How is the angle of emergence ‘i2’ related to the angle of incidence ‘i1’.
- What can you say about the angle of deviation in such a situation?
How does the angle of deviation depend on the refracting angle of the prism?
A ray of light is normally incident on one face of an equilateral glass prism. Answer the following:
What will be the angle of incidence at the second face of the prism?
A ray of light is normally incident on one face of an equilateral glass prism. Answer the following:
Will the light ray suffer minimum deviation by the prism?
Assertion: The light emerges from a parallel-sided glass slab in a direction perpendicular to that in which enters the glass slab.
Reason: The perpendicular distance between the original path of the incident ray and the emergent ray coming out of the glass slab is called lateral displacement of the emergent ray of light.
Draw a ray diagram showing the dispersion through a prism when a narrow beam of white light is incident on one of its refracting surfaces. Also indicate the order of the colours of the spectrum obtained.
Explain the phenomenon of dispersion of white light through a glass prism, using suitable ray diagram.
Name the colour of white light which is deviated the least on passing through a prism.
