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20. The refracting angle of a prism is 60 It is found that for two different angles ofcidence, the deviation produced by the prism is 40° If the difference between thetwo angle of incidence is 10s What are their values?(1) 55 45(2) 60, 50(3) 65, 55(4) 58°, 4821. The dispersion produced by an equilateral prism ot flint-glass is 2.16 and thatproduced by an equilateral prism of crown glass is 1.08°. What should be the angleof a crown glass prism, which will produce an achromatic combination with a flintglass prism of refracting angle 30?(2) 30°(3) 60°(4) 75

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