Start Free Mock LoginAlready registered? Login here

Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsRefraction at curved surface/LensHard2 minPYQ_2013

PhysicsHardsingle choice

An object placed at a distance of $16 cm$ from a $convex lens produces an image of$ magnification $m (m > 1)$ . If the object is moved towards the lens by $8 cm$ , then again an image of magnification $m$ is obtained. The numerical value of the focal length of the lens is

Options:

Answer:

Solution:

Linear magnification, $m = \frac{f}{f + u}$ As given that magnification is same for both cases this is possible if the two different values of $u$ are of opposite sign. $i, θ, + \frac{f}{f - 16} = \frac{- f}{f - 8}$ $\Rightarrow 16 - f = f - 8$ $\Rightarrow 2 f = 24$ or $f = 12 cm$

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

⏱ 2mℹ️ Source: PYQ_2013

Doubts & Discussion

Loading discussions...