Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsReflection at curved surfaceEasy2 minPYQ_2020

PhysicsEasysingle choice

A linear object is placed along the axis of a mirror as shown in the figure. If $f$ is the focal length of the mirror, then the length of the image is

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Answer:

Solution:

The image of object at $2 f$ will be formed at $2 f$ . So the object and image will coincide at $2 f$ .

$\frac{1}{v} - \frac{1}{u} = \frac{1}{f}$

$\frac{1}{v} - \frac{1}{(\frac{- 3 f}{2})} = \frac{1}{f}$

$\frac{1}{v} = \frac{1}{f} - \frac{2}{3 f} = \frac{1}{3 f}$

$∴$ Length of image $= 3 f - 2 f = f$

Subject:PhysicsTopic:Geometrical OpticsSubtopic:Reflection at curved surface

⏱ 2mℹ️ Source: PYQ_2020

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