Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsRefraction at plane surfaceMedium2 minPYQ_2018

PhysicsMediumsingle choice

A ray of light is incident normally on a glass slab of thickness $5 cm$ and refractive index $1.6$ . The time taken to travel by a ray from source to surface of the slab is the same as to travel through glass slab. The distance of the source from the surface is

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Answer:

Solution:

Velocity of light in medium, $v = \frac{5}{t}$
Velocity of light in vaccum, $c = \frac{x}{t}$
$μ = \frac{c}{v} = \frac{x}{5}$
$x = 5 μ = 8 cm$

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

⏱ 2mℹ️ Source: PYQ_2018

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