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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsReflection at curved surfaceHard2 minPYQ_2017

PhysicsHardsingle choice

A beam of light from a source $L$ is incident normally on a plane mirror fixed at a certain distance $x$ from the source. The beam is reflected back as a spot on a scale placed just above the source $L$ . When the mirror is rotated through a small angle $θ$ , the spot of the light is found to move through a distance $y$ on the scale. The angle $θ$ is given by

Options:

Answer:

Solution:

When mirror is rotated by $θ$ angle reflected ray will be rotated by $2 θ$ .

for small $θ,$ $\frac{y}{x} = 2 θ$

$θ = \frac{y}{2 x}$

Stream:NEETSubject:PhysicsTopic:Geometrical OpticsSubtopic:Reflection at curved surface

⏱ 2mℹ️ Source: PYQ_2017

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