What are reflecting telescopes made of? A. Lenses B. Mirrors C. Both lenses and mirrors D. None of the above 相关知识点: 试题来源: 解析 B。解析:文章中提到“Reflecting telescopes use mirrors.”,反射式望远镜是由镜子组成的。反馈 收藏 ...
Though glass lenses have the best optical quality, they are not recommended for active sports because they are heavy and more likely to shatter on impact than lenses made of polycarbonate or other materials. For the best possible vision, comfort and clarity in changing light conditions, considerph...
Optical lenses are made from several materials, each of which influences the mirrors reflectivity attributes. Choices for materials include borosilicate glass, copper, fused silica, nickel, and optic crown glass. Borosilicate glass is likewise called BK7 as well as boro-crown glass. Copper is used ...
According to the different classification of the frame material, there are mainly tungsten carbon, pure titanium, plate, TR90, magnesium aluminum, alloy, etc., different materials of the frame characteristics are not the same. 1: the tungsten carbon frame is made of...
Weighted blankets are a popular trend because they are thought to help with anxiety. The weight while you’re sleeping also helps to promote a better night’s sleep. These blankets come in a variety of sizes and weights. They’re also available in a variety of materials. Some are safe ...
The nuances of different capacitor types are, for the most part, determined by the characteristics of the dielectric used and the method by which a given device is constructed. All dielectric materials have limitations, with regard to the maximum applied field they can withstand for a given ...
Metals are made up of atomic materials such as electrons, neutrons, and protons. Atoms of different elements can be distinguished from one another by the number of protons they contain. Metals comprise about 25% of the earth's crust. It was found about 11,000 years ago. ...
What type of sunglasses should I wear? Sunglasses come in a variety of shapesand are made with various materials and lenses. From timeless styles such as the classic aviator, round, square, cat-eye and wrap-around sunglasses, to more extravagant styles including hexagonal, butterfly and clubmast...
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It is all about how different materials are put together and made up of atoms and molecules. Additionally, chemistry is how these materials act under different conditions. Slime is a non-Newtonian fluid. A non-Newtonian fluid is neither liquid nor a solid. It can be picked up like a solid...