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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsReflection at curved surfaceMedium2 minPYQ_2012

PhysicsMediumsingle choice

A rod of length $10 cm$ lies along the principal axis of a concave mirror of focal length $10 cm$ in such a way that its end closer to the pole is $20 cm$ away from the mirror. The length of the image is

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Answer:

Solution:

By mirror formula, image distance of $A$ $\frac{1}{v} + \frac{1}{u} = \frac{1}{f}$
$\frac{1}{v _{A}} + \frac{1}{u} \frac{1}{v _{A}} + \frac{1}{( - 30 )} v_{A} = \frac{1}{f} = \frac{1}{- 10} = - 15 cm$ Also image distance of $C$ $v_{C} = - 20 cm$ The length of image $= ∣ v_{A} - v_{C} ∣$ $= ∣ - 15 - (- 20) ∣$ $= 5 cm$

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

⏱ 2mℹ️ Source: PYQ_2012

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