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Physics Classroom is making strides to make our site accessible to everyone. Our site contains 6 navigation areas. The Primary, Secondary, and Page Level navigations have a screen reader version of their nav structure that allows using the left and right keys to navigate sibling navigation items, and up or down keys to navigate parent or child navigation items. The others can be navigated using tabs. The Primary Navigation handles the first 2 levels of site pages. The Secondary (which is not always available) handles the 3rd and 4th level of structure. The Page level navigation allows you to navigate the current page's headings quickly. The Header Navigation contains the Light/Dark Mode toggle, Search, Notifications and account login. The Breadcrumb Navigation contains the breadcrumb of the current page. If the current page has a breadcrumb, you can get to it by skipping to the content and tabbing in reverse (shift plus tab). The Footer Navigation contains links such as Privacy, Contact, about and terms. Some resources contain an Audio Player that can be activated by holding down the T key for 3 seconds, and then using K to pause and resume. While not every area of Physics Classroom is usable purely from keyboard and screen reader, we are committed to continue work on making this possible. If you have questions or need additional help, please use this link to contact us.

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Colored Shadows

So your physics teacher is standing in front of the white screen in the front of the room. The room lights are off and you're in charge of the three colored spotlights. With a flip of a switch, you can shine any combination of red, green and blue light on the teacher. As you do, your teacher's clothes show their color and shadows are cast onto the white screen. How does the light that is shining on the teacher affect the color of his clothes and the color of the shawows? Launch the Interactive and find out.

Users are encouraged to open the Interactive and begin. There is no need for an activity sheet for this Interactive.

Learners and Instructors may also be interested in viewing the accompanying Notes page. Technical information, teaching suggestions, and related resources that complement this Interactive are provided on the Notes page. View Notes.

NEWOur Colored Shadows simulation is now equipped with Task Tracker functionality. Learn more.

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