Khan Academy Static

4D: Without lenses, we would not be able to examine the layers of the skin or to observe the habits of the pink flamingo from a distance. If you have ever used a microscope, binoculars, or a magnifying glass, you have benefited from the workings of a thin lens, which refracts rays of light as it passes through the medium. In these tutorials, you’ll learn how to use ray tracings and the thin lens formula to predict the sizes and orientation of images created by thin lenses. We will apply these concepts to a discussion of the human eye.

15299_Convex_lenses.html

15300_Convex_lens_examples.html

15302_Object_image_and_focal_distance_relationship_proof_of_formula_.html

15304_Thin_lens_equation_and_problem_solving.html

15305_Multiple_lens_systems.html

15303_Object_image_height_and_distance_relationship.html

15301_Concave_lenses.html

15306_Diopters_Aberration_and_the_Human_Eye.html