Difference between revisions of "Translations:AY Honors/Optics/Answer Key/109/en"
From Pathfinder Wiki
(Importing a new version from external source) |
(Importing a new version from external source) |
||
| Line 3: | Line 3: | ||
[[Image:FocalLength.jpg|thumb|400px|Finding the focal length of a positive lens]] | [[Image:FocalLength.jpg|thumb|400px|Finding the focal length of a positive lens]] | ||
===Positive Lens=== | ===Positive Lens=== | ||
| − | Set a ruler on end on a work surface (a table, sidewalk, or a wood board). Using a bright light (such as the sun) as the light source, hold the lens against the ruler and slide it up and down the ruler until the light is focused on the work surface. | + | Set a ruler on end on a work surface (a table, sidewalk, or a wood board). Using a bright light (such as the sun) as the light source, hold the lens against the ruler and slide it up and down the ruler until the light is focused on the work surface. The point on the ruler that the focused lens touches is to be recorded as the Focal Length for that lens. |
{{clear}} | {{clear}} | ||
===Negative Lens=== | ===Negative Lens=== | ||
[[Image:Sistema afocale 2.png]] | [[Image:Sistema afocale 2.png]] | ||
{{clear}} | {{clear}} | ||
| − | Measuring the focal length of a negative lens is more difficult because light going through it does not converge to form an image. | + | Measuring the focal length of a negative lens is more difficult because light going through it does not converge to form an image. Instead, you will need to place a positive lens between the light source and the negative lens. Move the lenses and screen around until the light is focused. |
Latest revision as of 21:42, 24 April 2021
Positive Lens
Set a ruler on end on a work surface (a table, sidewalk, or a wood board). Using a bright light (such as the sun) as the light source, hold the lens against the ruler and slide it up and down the ruler until the light is focused on the work surface. The point on the ruler that the focused lens touches is to be recorded as the Focal Length for that lens.
Negative Lens
Measuring the focal length of a negative lens is more difficult because light going through it does not converge to form an image. Instead, you will need to place a positive lens between the light source and the negative lens. Move the lenses and screen around until the light is focused.
