The speed of light in media ‘A’ and ‘B’ are 2.0 × 1010 cm/s and 1.5 × 1010 cm/s respectively. A ray of light enters from the medium B to an incident angle ‘q’. If the ray suffers total internal reflection, then

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Physics Class 11th Units and Measurement

The speed of light in media ‘A’ and ‘B’ are 2.0 × 10¹⁰ cm/s and 1.5 × 10¹⁰ cm/s respectively. A ray of light enters from the medium B to an incident angle ‘q’. If the ray suffers total internal reflection, then

Option 1 -

$s i n^{- 1} (\frac{3}{4})$

Option 2 -

$θ > s i n^{- 1} (\frac{2}{3})$

Option 3 -

$θ < s i n^{- 1} (\frac{3}{4})$

Option 4 -

$θ > s i n^{- 1} (\frac{3}{4})$

2 Views | Posted 2 months ago

Asked by Shiksha User

1 Answer

Answered by

alok kumar singh | Contributor-Level 10

2 months ago

Correct Option - 4

Detailed Solution:

$\frac{s i n θ_{C}}{V_{B}} = \frac{s i n 90 °}{V_{A}} \Rightarrow s i n θ_{C} = \frac{V_{B}}{V_{A}} = \frac{1.5 \times 1 0^{10}}{2.0 \times 1 0^{10}} = \frac{3}{4}$

According to question, we can write

$θ > θ = s i n^{- 1} (\frac{3}{4})$

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The speed of light in media ‘A’ and ‘B’ are 2.0 × 10¹⁰ cm/s and 1.5 × 10¹⁰ cm/s respectively. A ray of light enters from the medium B to an incident angle ‘q’. If the ray suffers total internal reflection, then

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