[amp_mcq option1=”lens” option2=”mirror” option3=”combinations of lenses” option4=”None of the above” correct=”option2″]<\/p>\n
The correct answer is: B. mirror<\/strong><\/p>\n Large astronomical telescopes always use a mirror as the objective because it is more efficient than a lens. A mirror can reflect all of the light that hits it, while a lens can only transmit a fraction of the light that hits it. This is because a mirror is a solid object, while a lens is made up of two pieces of glass that are separated by air. The air between the two pieces of glass causes some of the light to be lost.<\/p>\n In addition, a mirror can be made much larger than a lens of the same weight. This is because a mirror is supported by its back, while a lens is supported by its edges. The edges of a lens are more likely to break than the back of a mirror.<\/p>\n Finally, a mirror is less expensive to make than a lens of the same size. This is because a mirror can be made out of a single piece of glass, while a lens must be made out of two pieces of glass that are ground and polished to a precise shape.<\/p>\n Option A is incorrect because a lens is not as efficient as a mirror. Option C is incorrect because a combination of lenses is not as efficient as a single mirror. Option D is incorrect because large astronomical telescopes always use a mirror as the objective.<\/p>\n","protected":false},"excerpt":{"rendered":" [amp_mcq option1=”lens” option2=”mirror” option3=”combinations of lenses” option4=”None of the above” correct=”option2″]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25],"tags":[],"class_list":["post-21781","post","type-post","status-publish","format-standard","hentry","category-physics","no-featured-image-padding"],"yoast_head":"\n