7th Grade Science Chapter 9 Lesson 3 vocabulary
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| index of refraction | A measure of the amount a ray of light bends when it passes from one medium to another.
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| mirage | An image of a distant object caused by refraction of light as it travels through air of varying temperature.
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| lens | The flexible structure that focuses light that has entered
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| concave lens | A lens that is thinner in the center than at the edges.
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| convex lens | A lens that is thicker in the center than at the edges.
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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