Neco 2025 Physics Question 43
Practice objective / multiple choice question 43 from the 2025 Neco Physics examination.
A glass prism has an apex angle \(A=60^{\circ}\). Its refractive index follows Cauchy's relation \(n(\lambda)=A_{c}+\frac{B}{\lambda^{2}}\) (\(\lambda\) in nanometres). For red light (\(\lambda_{r}=700\) nm) the index is \(n_{r}=1.62\). When violet light (\(\lambda_{v}=400\) nm) passes through the prism, the measured minimum deviation is \(\delta_{v}=50^{\circ}\).\n\n(a) Determine the constants \(A_{c}\) and \(B\).\n(b) Using these constants, find the minimum deviation angle for yellow light of wavelength \(\lambda_{y}=580\) nm. Give your answer to one decimal place.
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About This Question
This is Neco 2025 Physics Question 43. It is one of the objective questions from the 2025 Neco Physics examination.
Difficulty level: Medium .
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