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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsRefraction at curved surface/LensEasy2 minPYQ_2020

PhysicsEasysingle choice

When an object is at distance $x$ and $y$ from a lens, a real image and a virtual image are formed respectively having the same magnification. The focal length of the lens is

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Answer:

Solution:

The given lens is a convex lens. Let the magnification be m, then for real image using lens formula

$\frac{1}{m x} + \frac{1}{x} = \frac{1}{f}$ .......(i)

And for virtual image

$\frac{1}{- m y} + \frac{1}{y} = \frac{1}{f}$ ........(ii)

From equation (i) and equation (ii),

we get $f = \frac{x + y}{2}$

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

⏱ 2mℹ️ Source: PYQ_2020

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