Passage: The Fresnel Lens
In the early 1800s, navigation was basic. Although ship captains did have some tools to guide them, they still relied heavily on eyesight. This was especially true when they were close to shore. Captains were on constant lookout to make sure their ship didn't run aground. Lighthouses were constructed to make the shore easier to see. The problem was that lighthouses had weak lights. They could not be seen from far away. This problem was solved by a French physicist named Augustin-Jean Fresnel. Fresnel invented a lens that would focus light into a single source. This focused light could be seen from many miles away.
What conclusion can we make from the information in this passage?
A. Fresnel was the greatest inventor of the 19th century.
B. Before the Fresnel lens, lighthouses were useless.
C. Ship captains had very good eyesight in the 1800s.
D. Light can be made more powerful by focusing it.
E. Navigation has advanced a lot in the last 100 years.
Answers: 1
English, 21.06.2019 14:20
Adam posted in a thread about theoretical physics. in his post he refuted general relativity and cited a paper that was recently self-published by one person on her own personal website and had no references to other works in the field.which important question did adam not answer sufficiently when evaluating the cited paper?
Answers: 2
English, 21.06.2019 21:40
4.in those days the church was not merely a thermometer that recorded the ideas and principles of popular opinion; it was a thermostat that transformed the mores of society. •type of figurative language: •meaning of figurative language: •effect on tone and mood: •effect on audience: choose out of these: hyperbole, irony, historical question, paradox, allusion,metaphor,personification,symbolism and simile
Answers: 3
English, 22.06.2019 00:00
What else do you think experts can learn from studying the language of written work? what do you think is the value of studying the language of william shakespeare whose writing is over hundreds of years old?
Answers: 1
Passage: The Fresnel Lens
In the early 1800s, navigation was basic. Although ship captains did have...
Mathematics, 17.06.2020 19:57
Mathematics, 17.06.2020 19:57
Computers and Technology, 17.06.2020 19:57
Mathematics, 17.06.2020 19:57
Geography, 17.06.2020 19:57
Chemistry, 17.06.2020 19:57
Computers and Technology, 17.06.2020 19:57
English, 17.06.2020 19:57
Mathematics, 17.06.2020 19:57
Social Studies, 17.06.2020 19:57