If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

Circle of confusion diagram

Problem

Below is a diagram which we'll use to calculate the radius of the circle of confusion for an object out of focus.
Click and drag on descriptions below to match them to the correct label.
1