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Grade: 10
        A thin prism is made of a material having refractive indices 1.61 and 1.65 for red and violet light. The dispersive power of the material is 0.07. It is found that a beam of yellow light passing through the prism suffers a minimum deviation of 4.0° in favourable conditions. Calculate the angel of the prism.
5 years ago

Answers : (2)

Jitender Pal
askIITians Faculty
365 Points
							Given that, μ base r = 1.61, μ base v = 1.65, ω = 0.07 and δ base y = 4°
Now, ω = μ base v - μ base r/ μ base y – 1 
⇒ 0.07 = 1.65 – 1.61/μ base y – 1
⇒ μ base y – 1 = 0.04/0.07 = 4/7
Again, δ = (μ – 1) A
⇒ A = δ base y/μ base y – 1 = 4/(4/7) = 7°

						
5 years ago
Aditi Chauhan
askIITians Faculty
396 Points
							Sol. Given that, μ base r = 1.61, μ base v = 1.65, ω = 0.07 and δ base y = 4°
Now, ω = μ base v - μ base r/ μ base y – 1 
⇒ 0.07 = 1.65 – 1.61/μ base y – 1
⇒ μ base y – 1 = 0.04/0.07 = 4/7
Again, δ = (μ – 1) A
⇒ A = δ base y/μ base y – 1 = 4/(4/7) = 7°

						
5 years ago
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