Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsRefraction at curved surface/LensMedium2 minPYQ_2006

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If a convex lens of focal length 80 cm and a concave lens of focal length 50 cm are combined together, what will be their resultant power ?

Options:

Answer:

Solution:

$f_{1} = + 80 cm, f_{2} = - 50 cm$ . Resultant focal length $F = \frac{f _{1} f _{2}}{f _{1} + f _{2}} = \frac{80 \times - 50}{80 - 50} = \frac{- 4000}{30} = - \frac{4000}{3} cm .$ Resultant power $P = \frac{100}{F} = \frac{100}{- 400/3} = - \frac{3}{4} = - 0.75 D .$

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

⏱ 2mℹ️ Source: PYQ_2006

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