A microscope is an instrument that magnifies objects, enabling visibility of 1,000 times or more than what can be seen by the naked human eye. Microscopes of various types assist researchers with medical diagnostics, and they have aided scientists in attaining knowledge of biology and material science.Know More
Optical microscopes, which are the oldest design of microscopes, are often used for teaching purposes in biology classrooms. These instruments work by using a small, spherical lens, referred to as an objective lens that is contained within the microscope's tube. The objective lens is aimed at an illuminated object that is brought into focus. A second lens, known as the ocular lens, magnifies the image for enhanced viewing.
Because light is used to image the object, optical microscopes were limited in their use until the availability of electrical light sources. The origins of the microscope are a subject of debate. However, its invention in the late 1500s is often attributed to Zacharias Jansen, a Dutch eyeglass maker.
There are other types of more sophisticated microscopes that function differently from the optical microscope. Digital microscopes use digital cameras to view images. The electron microscope, developed in the early 1900s, uses electrons for imaging objects. Due to the high magnification power of electron microscopes, they serve as important instruments for medical and scientific research.Learn more in Science
Almost everything in the modern world revolves around science. It is part of daily activities, including cooking, gardening, understanding a weather report, reading a map and using a computer. Science is the knowledge of the natural and physical elements in the world. Nutritional choices are science because the process involves choosing products with least impact on the environment, or making informed choices about one’s health care.Full Answer >
In an experiment following the scientific method, a constant is a variable that cannot be changed or is purposely not changed during the experiment. Some constants are purposeful and selected by the scientist to control an experiment while others are more universal and beyond a researcher's control.Full Answer >
A constant variable, normally called a controlled variable, is the term for a variable that remains constant throughout an experiment, though other variables may change. An example is the water pressure for a faucet when measuring the amount of water released when the faucet is opened to various increments.Full Answer >
Science changes due to several factors including technological innovations, societal concerns and increases of knowledge. Scientific information expands as humans disseminate research through peer-reviewed publications, collaborate on new projects and regulate studies through legislation.Full Answer >