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(a) Find the $f$ -number of a telescope with an objective diameter of8.3 $\mathrm{cm}$ and a focal length of 91 $\mathrm{cm} .$ (b) Find the aperture diameter ofan $f / 1.2$ all-sky meteor camera lens with a focal length of 2.5 $\mathrm{mm} .$

a) 11b) 2.1 $\mathrm{mm}$

Physics 103

Chapter 27

Optical lnstruments

Wave Optics

Rutgers, The State University of New Jersey

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Okay, so in Robin 11 we need to discover the F number over telescope. And we know that this telescope has a diameter off eight point three saying team enters and a focal and wolf 91 same team enters. Okay, so we know that the F number off any optical system C F number is just bifocal and divided by dear teacher diameter. So to calculate the first item spurting here, the first item we just need to divide you. Four Go number The focal lens. Forgive feature diameter. So he's just 91 divided by 8.3. So this is equals two 11. And this second Aiken, we need to calculate the future diameter over. Meet your camera so we know that your future diameter is just going to be f divided by F number. So this needs to be equals two. Let's see 2.5 with the meters. That is the focal length of the camera divided by the F number. Off the camera, there is one point two. So did a feature. Diameter is just 2.1 limiters, and that's the final answer to this problem. Thanks for watching

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