ppt模板小船交通主題(編輯修改稿)
2024-08-18 08:59 本頁面
【文章內(nèi)容簡介】 。s disk can be viewed using appropriate filtration to block the harmful part of the Sun39。s radiation. Sunglasses do not make viewing the sun safe. Only properly designed and certified solar filters should be used for direct viewing of the Sun39。s disk.[48] Especially, selfmade filters using mon objects such as a floppy disk removed from its case, a Compact Disc, a black colour slide film, etc. must be avoided despite what may have been said in the media.[49] ? The safest way to view the Sun39。s disk is by indirect projection. This can be done by projecting an image of the disk onto a white piece of paper or card using a pair of binoculars (with one of the lenses covered), a telescope, or another piece of cardboard with a small hole in it (about 1 mm diameter), often called a pinhole camera. The projected image of the Sun can then be safely viewed。 this technique can be used to observe sunspots, as well as eclipses. Care must be taken, however, to ensure that no one looks through the projector (telescope, pinhole, etc.) directly. Viewing the
環(huán)評(píng)公示相關(guān)推薦
鄂ICP備17016276號(hào)-1