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  1. Microscopy: Intro to microscopes & how they work (article

    In a light microscope, visible light passes through the specimen (the biological sample you are looking at) and is bent through the lens system, allowing the user to see a magnified image.

  2. Compound microscope (video) | Lenses | Khan Academy

    Let's explore the principle of a compound microscope and then logically build one, step by step.

  3. Cell biology and microscopy (article) | Khan Academy

    A light microscope shines light through a specimen (such as a cell), and then through a series of lenses. These lenses refract (bend) the light in such a way that the image of the specimen is …

  4. Compound microscope (video) | Khan Academy

    Let's explore the principle of a compound microscope and then logically build one, step by step.

  5. Cells and organisms (article) | Khan Academy

    All cells come from other cells. New cells are made through a process called cell division. During cell division, one cell grows and splits into two. Single cells are typically too small to be seen …

  6. Simple microscope (video) | Khan Academy

    Let's explore how a magnifying glass (simple microscope) really works. Created by Mahesh Shenoy.

  7. Solved example: magnifying power of compound microscope

    we have a compound microscope whose objective focal length is 5 millimeters eyepiece focal length is 2 and 1/2 centimeters a sample is kept at 6 millimeters from the objective find the …

  8. Simple Microscope - qualitative (practice) | Khan Academy

    Mahesh wants to examine a leaf using a simple microscope of focal length f . He keeps the leaf at a distance greater than f from the microscope and observes that he can only see a blurred …

  9. Chromosomes and genes (article) | Khan Academy

    Even though we can't see a risk the same way we see eye color or height, we can observe patterns over time. For example, if several people in a family have asthma or diabetes, that …

  10. Photoreceptors (rods vs cones) (video) | Khan Academy

    Rods and cones are two types of photoreceptors in the eye. Both are specialized nerves that convert light into neural impulses, but they differ in number, location, and function.