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Mathematics is the most important tool of science. The quest to understand the world and the universe using mathematics is as old as civilisation, and has led to the science and technology of today. Learn about the techniques and history of mathematics on


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Question: With a concave mirror, an object 24 cm from the mirror forms an image 16 cm from the mirror. What is the focal length?

Go to the article about: Concave mirrors

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It is wrong to think that the task of physics is to find out how nature is. Physics concerns what we can say about nature.

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