An $\frac{f}{2\mathrm{.}90}$ CCD camera has a $103$ mm focal length lens and can focus on objects from infinity to as near as $29\mathrm{.}0$ cm from the lens. Note: $"\frac{f}{2\mathrm{.}90}"$ means $"$an $f-$number of $2\mathrm{.}90."$

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$($a$)$ Determine the camera's aperture diameter in mm $.$

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Determine the minimum and maximum distances in cm from the CCD sensor over which the lens must be able to travel during focusing.

$($b$)$ minimum

$$ A camera is $"$in focus" when its lens is positioned so that the object's image forms on the sensor$.$ Modern cameras have electronic circuits that provide auto$-$focus features. cm

$($c$)$ maximum

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cm

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