Video on the REFRACTION of light

Feb 22, 2023

The video has tricks that you can try with your children.

It is also recommended for those studying physics as it explains refraction in a way that is easy to understand.

The explanation here is clearer than that in textbooks so students are encouraged to watch it.

I have another post with a video by the same person that is also highly recommended for students studying physics.

Cameras, telescopes, microscopes, and magnifying glasses produce images.The images produced by telescopes, microscopes and magnifying glasses are bigger than the object looked at.The image produced and captured by cameras is smaller than the object.Of all the instruments mentioned magnifying glasses is the one where most of us have used.Does how far away we place the magnifying glass from an object have an effect on the size of the image we see?Lenses can be divided into 2 categories depending on the shape of their surfaces - Convex lens and concave lens. (For this post, we shall ignore that are flat on one side and convex/concave on the other side)Lenses have focal length. Where we place on object compared to the focal length will have effects on the image it produce : the position of the image, whether the image is real or virtual, whether the image is upright or inverted (upside down), and whether the image is magnified/diminished (size of the image)Those who are studying physics may be asked about the quality of images as mentioned in the above paragraph.They may also be asked to draw ray diagrams for different types of lenses based on the position of the object compared to the focal length of the lens.The video below explains the concepts more clearly than textbooks do. It even tell you tips how you can cheat to ensure your ray diagram is correct.If you know the theory, do not draw rays and take the point where the rays meet to produce the image. Inaccuracies in your drawing may produce wrong answers.Draw the image at the correct position and of the right size. Then draw the rays to fit the image.

bbs.market🦋 Lenses and the images they produce.Cameras, telescopes, microscopes, and magnifying glasses produce images.The images produced by telescopes, microscopes and magnifying glasses are bigger than the object looked at.The image produced and captured by cameras is smaller than the object.Of all the instruments mentioned magnifying glasses is the one where most of us have used.Does how far away we place the magnifying glass from an object have an effect on the size of the image we see?Lenses can be divided into 2 categories depending on the shape of their surfaces - Convex lens and concave lens. (For this post, we shall ignore that are flat on one side and convex/concave on the other side)Lenses have focal length. Where we place on object compared to the focal length will have effects on the image it produce : the position of the image, whether the image is real or virtual, whether the image is upright or inverted (upside down), and whether the image is magnified/diminished (size of the image)Those who are studying physics may be asked about the quality of images as mentioned in the above paragraph.They may also be asked to draw ray diagrams for different types of lenses based on the position of the object compared to the focal length of the lens.The video below explains the concepts more clearly than textbooks do. It even tell you tips how you can cheat to ensure your ray diagram is correct.If you know the theory, do not draw rays and take the point where the rays meet to produce the image. Inaccuracies in your drawing may produce wrong answers.Draw the image at the correct position and of the right size. Then draw the rays to fit the image.

If you stand at the edge of a swimming pool and look at a spot in the pool 2 m away, the water looks shallower than it actually is.

If you stand in the pool and look straight down, does the water look deeper or shallower than the real depth? Why does the depth look that way?

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