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Geometrical Optics question

2001 · Q138
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Geometrical Optics question

2001 · Q138

NEETPhysicsGeometrical OpticsMCQ+4 / −1
A disc is placed on a surface of pond which has refractive index 5/3. A source of light is placed 4 m below the surface of liquid. The minimum radius of disc needed so that light is not coming out is,
  1. A
    ∞\infty∞
  2. B
    3 m
  3. C
    6 m
  4. D
    4 m
View written solutionFree

Correct answer: B

AIPMT 2001 Physics - Geometrical Optics Question 34 English Explanation


$$\theta = {\sin ^{ - 1}}\left( {{1 \over \mu }} \right)$$ = $${\sin ^{ - 1}}\left( {{3 \over 5}} \right)$$

$ \Rightarrow $ $$\sin \theta = {3 \over 5}$$

$ \therefore $ tan$\theta $ = ${3 \over 4}$ = ${r \over 4}$

$ \Rightarrow $ r = 3 m
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