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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsOptical instrumentsMedium2 minPYQ_2006

PhysicsMediumsingle choice

If the focal length of a lens of a camera is $5 f$ and that of another is $2.5 f$ , what is the time of exposure for the second, if for the first one is $\frac{1}{200} s$ ? (where $f$ is focal length/unit aperture)

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Answer:

Solution:

Ratio of time of expoiusers $\frac{t _{1}}{t _{2}} = (\frac{f _{1}}{f _{2}})^{2} = (\frac{5 f}{2.5 f})^{2} \Rightarrow \frac{1/200}{t _{2}} = (2)^{2} \Rightarrow t_{2} = \frac{1}{800} s$

Stream:JIPMERSubject:PhysicsTopic:Geometrical OpticsSubtopic:Optical instruments

⏱ 2mℹ️ Source: PYQ_2006

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