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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsRefraction+ReflectionMedium2 minPYQ_2011

PhysicsMediumsingle choice

Two lens of focal lengths $- 20 cm$ and $+ 10 cm$ are put in combination, find the power of the combination.

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Answer:

Solution:

Here $f_{1} = - 20 cm, f_{2} = + 10 cm$ Focal length of combination is, $\frac{1}{F} = \frac{1}{f _{1}} + \frac{1}{f _{2}} = \frac{1}{- 20} + \frac{1}{10} \frac{1}{F} = \frac{1}{20} \Rightarrow F = 20 cm$ Power of the combination, $P = \frac{100}{F} = \frac{100}{20} = + 5 D$

Stream:AIIMSSubject:PhysicsTopic:Geometrical OpticsSubtopic:Refraction+Reflection

⏱ 2mℹ️ Source: PYQ_2011

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