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MCQEasyJEE 2025Prisms & Total Internal Reflection

JEE Physics 2025 Question with Solution

Consider following statements for refraction of light through prism, when angle of deviation is minimum.

  • A

    A, C and D Only

  • B

    B, C and D Only

  • C

    A, B and E Only

  • D

    B, D and E Only

Answer

Correct answer:A

Step-by-step solution

Standard Method

Given: Statements about refraction of light through a prism at minimum deviation are to be checked.

Find: Which combined option is correct.

At minimum deviation, the path of the ray through the prism is symmetric. Therefore,

i=ei = e

and the refracted ray inside the prism becomes parallel to the base of the prism.

So statement A is correct and statement C is correct.

For a larger prism angle, the minimum deviation generally increases, so statement B is incorrect.

For a given deviation, there are two values of angle of incidence except at the minimum deviation condition, so statement D is correct.

Statement E is incorrect because at minimum deviation,

r1=r2=A2r_1 = r_2 = \frac{A}{2}

not double of prism angle.

Hence the correct set of statements is A, C and D only. Therefore, the correct option is A.

The solution labels option A as the correct option, and this corresponds to A, C and D Only.

Common mistakes

  • Assuming that a larger prism angle gives a smaller minimum deviation. This is wrong because minimum deviation generally increases with prism angle. Check the prism geometry and the minimum deviation relation before concluding.

  • Forgetting the symmetry condition at minimum deviation. This is wrong because the key result is i=ei=e and the internal ray becomes parallel to the base. Always test statements using the symmetric path condition.

  • Misreading the combined-option format and treating statements and answer choices as the same options. This is wrong because the final options are combinations of statements. First judge each statement, then select the matching combination.

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