JEE Advanced 2026 Physics question
A beam of polychromatic light passes through a thin prism of prism angle . The refractive index of the material of the prism varies with wavelength as , where and . If is the wavelength at which the angle of minimum deviation is smallest, then the correct value of at is
Answer: (B)
Solution
For a **thin** prism the minimum deviation is , so is smallest where is smallest.
=α-=0\ \ λ^{3}===0.064\ μm^3\ \ λ_{}=0.4\ μm.
Since $
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