Class 12 ISC Physics Board Questions Chapter Refraction and Dispersion of Light

Class 12 ISC Physics Refraction and Dispersion of Light Board Questions

Here we provide Class 12 Physics important notes,board questions and predicted questions with Answers for chapter Refraction and Dispersion of Light. These important notes,board questions and predicted questions are based on ISC board curriculum and correspond to the most recent Class 12 Physics syllabus. By practising these Class 12 materials, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 12 Board examinations as well as other entrance exams such as NEET and JEE.

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Board Questions

Important Notes

Refraction and Dispersion of Light BoardQuestions

Q1 Calculate dispersive power of a transparent material given : nv = 1.56 , nr = 1.54 , ny = 1.55.

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Q2 Find the angle of incidence at which a ray of monochromatic light should be incident on the first surface AB of a regular glass prism ABC so that emergent ray grazes is the adjacent surface AC. (Refractive index glass = 1.56)

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Q3 In a regular prism, what is the relation between angle of incidence and angle of emergence when it is in the minimum deviation position?

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Q4 State any 2 differences between primary rainbow and secondary rainbow.

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Two basic differences between primary and secondary rainbows are :

Primary Rainbow : 1. It is formed by rays that undergo one total internal reflection and two times refraction before emerging finally from water droplets.
2. Primary rainbow is very bright as compared to secondary rainbow.

Secondary Rainbow : 1. It is formed by rays that undergo two internal reflection and two times refraction before emerging finally from water droplets.
2. Secondary rainbow is less bright in comparison to primary rainbow.

Q5 The deviation produced for Violet, yellow and red lights for crown glass are 3.75^o, 3.25^o and 2.86^o respectively. Calculate the dispersive power of the crown glass.

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Q6 For any prism prove that :

where the terms have their usual meaning

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The relation between refractive index and the angle of incidence and refractive angle in the term of prism angle and minimum angle of deviation is

μ=(Sin(A+δm/2))/SinA/2

And the angle of incidence and the refraction for prism in the term of prism angle are

i= A+δm/2 andr=A/2

Q7 A ray of light is incident on a prism whose refractive index is 1.52 and angle of 40⁰. The angle of emergence is 60⁰, calculate the angle of prism

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