Consider the situation where you want to put a camera in a car, looking towards the front of the car. A car is roughly $2\mathrm{.}5$m wide. You have a camera with a $1$cm wide sensor with $2000$ horizontal pixels.

If you want the car to be at least $50$ pixels wide at $100$m$,$ what does your focal length need to be$?$ Give the answer in mm$.$ Be sure to identify which equation is relevant to the question before starting.

How many pixels would a car be in the image at $12\mathrm{.}5$m with the same focal length?

Given a $10$mm lens, do you need to make any adjustments for the scene to be in focus from $20-100$m$?$

Answer rating: 100% (QA)

Calculating Focal Length for Car Image The relevant equation for this scenario is the similar triang... View the full answer