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Geometrical Optics question

2000 · Q133
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Geometrical Optics question

2000 · Q133

NEETPhysicsGeometrical OpticsMCQ+4 / −1
A bubble in glass slab (μ\muμ = 1.5) when viewed from one side appears at 5 cm and 2 cm from other side, then thickness of slab is
  1. A
    3.75 cm
  2. B
    3 cm
  3. C
    10.5 cm
  4. D
    2.5 cm.
View written solutionFree

Correct answer: C

From one side, t−x5=1.5{{t - x} \over 5} = 1.55t−x​=1.5

From other side, x2{x \over 2}2x​ = 1.5 ⇒\Rightarrow⇒ x = 3

∴\therefore∴ t−35=1.5{{t - 3} \over 5} = 1.55t−3​=1.5 ⇒\Rightarrow⇒ t = 10.5 cm

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