Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsReflection at curved surfaceEasy2 minPYQ_2020

PhysicsEasysingle choice

A large temple has a depression in one wall. On the floor plan, it appears as an indentation having a spherical shape of radius $2 .50 m$ . A worshiper stands on the centerline of the depression, $2 .00 m$ out from its deepest point, and whispers a prayer. Where is the sound concentrated after reflection from the black wall of the depression?

Options:

Answer:

Solution:

Wall will act as concave mirror

$\frac{1}{v} + \frac{1}{u} = \frac{1}{f} \Rightarrow \frac{1}{v} + \frac{1}{u} = \frac{2}{R} \Rightarrow \frac{1}{v} + \frac{1}{- 2} = \frac{2}{- 2.5}$

$\frac{1}{v} = \frac{2}{- 2.5} + \frac{1}{2} \Rightarrow \frac{1}{v} = \frac{- 8 + 5}{10}$

$\frac{1}{v} = \frac{- 3}{10}$

$v = \frac{- 10}{3} m$

Subject:PhysicsTopic:Geometrical OpticsSubtopic:Reflection at curved surface

⏱ 2mℹ️ Source: PYQ_2020

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