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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsRefraction at curved surface/LensMedium2 minQB

PhysicsMediumsingle choice

. A convex lens of focal length 40 cm is held coaxially 12 cm above a concave mirror of focal length 18 cm. An object held x cm above the lens gives rise to an image coincident with it. The x is equal to

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Answer:

Solution:

Rays from O must fall normally on the mirror, only then the lens forms a virtual image at C (the centre of curvature).

$\Rightarrow \frac{1}{x} + \frac{1}{- ( 36 - 12 )} = \frac{1}{40} \Rightarrow x = 15 cm$

Stream:JEESubject:PhysicsTopic:Geometrical OpticsSubtopic:Refraction at curved surface/Lens

⏱ 2mℹ️ Source: QB

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