Practice question · Estimate
Two objects stand at 2 metres and 4 metres from the camera. Set the ratio of their image sizes, near to far.
Estimate on a scale from 1 to 1 (0) to 6 to 1 (6).
Hints
- Image size falls off as one over the distance.
- Half the distance, twice the size.
Show the answer
2 (answers within ±0.4 count)
Why
2 to 1. Image size is inversely proportional to distance, so the object at half the distance renders twice as large. No lens can alter this ratio, because a lens magnifies both objects by the same factor, which is the whole argument of the lesson in one number.
Practise Point of View
The app has 6 more questions on this lesson, and keeps your place in the course. Photography I is free to start.
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