Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsRefraction at curved surface/LensMedium2 minQB

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. A converging lens of focal length 20 cm is placed in contact with a converging lens of focal length 30 cm. The focal length of this combination is:

Answer:

Solution:

$\frac{1}{F} = \frac{1}{f _{1}} + \frac{1}{f _{2}} = \frac{1}{20} + \frac{1}{30} = \frac{5}{60} \Rightarrow F = + 12 cm$

Hence (A).

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

⏱ 2mℹ️ Source: QB

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