JEE mains Previous year question chapter :- Geometrical Optics
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5
Answer:
Option (d) is correct
Explanation:
We know that , angle of deviation for small prism
"D" = (μ - 1 )
For red light D₁ = (1.525 - 1)A
For green light D₂ = (1.520 - 1 ) A
- → D₁ /D₂ < 1
- D₂ > D₁
For the blue light, μ is greater that for red light ,
so D₂ >D₁
Answered by
2
Explanation:
D₁ and D₂ be the angels of minimum deviation for red and blue lights respectively.
then,
refractive index of glass for red light, μ₁ = 1.520
refractive index of glass for blue light, μ₂ = 1.525
we know,
minimum deviation, D = (μ-1)A where A is the angle of prism.
→ D₁ = (μ₁-1)A
= (1.520-1)A
= 0.52A
and
→D₂ = (μ₂-1)A
= (1.525-1)A
= 0.525A
∴ D₂ > D₁
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