Q1
Consider a ray of light passing through a prism (angleA
) in the position of minimum deviation (angleδ
). Show that the angles of incidence and refraction are given by i=(A+δ)/2,r=A/2
Solution
Q2
Why is a ray of light deviated by a prism? Draw a graph showing the variation of the angle of deviation with the angle of incidence. Derive an expression for the refractive index of the material of the prism in terms of its refracting angle and the angle of minimum deviation.
Solution
Q3
For any prism, show that refractive index of its material is given by 
where symbols have their usual meaning.
Solution
where symbols have their usual meaning.
Solution
Q4
What is dispersion of light? Explain why white light is dispersed when passing through a prism.
Solution
Q5
Define dispersive power of an optical medium. Obtain a formula for the dispersive power of the material of a prism in terms of refractive indices.
Solution
Q6
Draw ray diagram to illustrate formation of primary rainbow (using single water drop only and a single incident-ray, to show clearly refraction and total internal reflection, use at least four arrows)s
Solution
