Solutions - CBSE Class 10 Sample Paper for 2022 Boards - Science [MCQ]

Question 58 (Case Based MCQ) - Solutions - CBSE Class 10 Sample Paper for 2022 Boards - Science [MCQ] - Solutions to CBSE Sample Paper - Science Class 10

Last updated at May 29, 2023 by Teachoo

She measured the angles of incidence for both the rays on the left side of the box to be 48.6
°
. She knew the refractive index of the material ‘X’ inside the box was 1.5. What will be the approximate value of angle of refraction?

(A) 45
°

(B) 40
°

(C) 30
°

(D) 60
°
(use the value: sin 48.6
°
≈ 0.75)

Answer -

Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class

Question 58 She measured the angles of incidence for both the rays on the left side of the box to be 48.6° . She knew the refractive index of the material ‘X’ inside the box was 1.5. What will be the approximate value of angle of refraction? (A) 45° (B) 40° (C) 30° (D) 60° (use the value: sin 48.6° ≈ 0.75) Given,
Angle of incidence = i = 48.60
Angle of reflection = r = ?
We know that
Refractive index of any medium = sin𝑖/sin𝑟
1.5 = 𝐬𝐢𝐧〖𝟒𝟖.𝟔〗/𝐬𝐢𝐧𝒓
Putting sin 48.6° = 0.75
1.5 = 0.75/sin𝑟
sin r = 0.75/1.5
sin r = (75/100)/(15/10)
sin r = 75/100 × 10/15
sin r = 5/10
sin r = 𝟏/𝟐
Thus, r = 300
So, the correct answer is (C)

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo

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