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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsRefraction at plane surfaceEasy2 minPYQ_2020

PhysicsEasysingle choice

When a picture drawn on paper is seen through a slab of a transparent material of thickness $5 cm$ , it appears to be raised by $1.5 cm$ . The critical angle at the boundary of this transparent material and air is -

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Answer:

Solution:

$s = (1 - \frac{1}{μ}) t$

$1 - \frac{s}{t} = \frac{1}{μ}$

$μ = \frac{1}{1 - \frac{s}{t}} = \frac{1}{1 - \frac{3}{2 \times 5}} = \frac{10}{7}$

$\Rightarrow θ_{c} = \sin^{- 1} (\frac{1}{μ})$

$\Rightarrow θ_{c} = \sin^{- 1} (\frac{7}{10})$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Geometrical OpticsSubtopic:Refraction at plane surface

⏱ 2mℹ️ Source: PYQ_2020

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