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Grade: 11
        The minimum deviations suffered by red, yellow and violet beams passing through an equilateral transparent. Prism are 38.4°, 38.7° and 39.2° respectively. Calculate the dispersive power of the medium.
5 years ago

Answers : (2)

Aditi Chauhan
askIITians Faculty
396 Points
							Given that, δ base r = 38.4°, δ base y = 38.7° and δ base v = 39.2°
Dispersive power = μ base v - μ base r/ μ base y – 1 = (μ base v - 1) – (μ base v - 1) – (μ base r - 1)/( μ base y - 1) = (δ base v/A) - (δ base r/A)/ (δ base v/A) [∵ δ = (μ – 1) A]
= δ base v - δ base r/ δ base y = 39.2 – 38.4/38.7 = 0.0204

						
5 years ago
Navjyot Kalra
askIITians Faculty
654 Points
							Sol. Given that, δ base r = 38.4°, δ base y = 38.7° and δ base v = 39.2°
Dispersive power = μ base v - μ base r/ μ base y – 1 = (μ base v - 1) – (μ base v - 1) – (μ base r - 1)/( μ base y - 1) = (δ base v/A) - (δ base r/A)/ (δ base v/A) [∵ δ = (μ – 1) A]
= δ base v - δ base r/ δ base y = 39.2 – 38.4/38.7 = 0.0204

						
5 years ago
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