While performing an experiment on determination of focal length of a convex lens, four students obtained the image of the same distant tree on the screen as follows: Which diagram shows the formation of image correctly?
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Examples of Pure Substances 1. Pure substances have a uniform chemical composition. Examples include water (liquid), diamond (solid), and oxygen (gas)
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El Niño is an abnormal weather pattern caused by the warming of the Pacific Ocean near the equator, off the coast of South America. The sun warms the water near the equator, which can make more clouds and, therefore, more rain. However, normally there are trade winds, which blow that warm water west.
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