Boondock Saint

02-06-2005, 01:02

Hey, finals are coming up, just got a quick question for you all. It concerns refraction of light through concave and convex lenses (I quite literally slept through the whole chapter). What I need to know is how to do a few problems, what formulas, and the steps involved.... any help would be greatly appreciated. Also, I just realized that I now have a credit card... however, I will not make any donations to Portent until I know for sure its going to be back, and on a secure server...

Ok, here goes.

A converging lens has a focal length of 20 cm. If it is placed 50 cm from an object, at what distance from the lens will the image be?

If an object is 10 cm from a converging lens of 5 cm focal length, how far from the lens will the image be formed?

An object 3.0 cm tall is placed 20 cm from a converging lens. A real image is formed 10 cm from he lens. What is (a) the focal length of the lens, (b) the size of the image?

When an object 5 cm tall is place 12 cm from a converging lens, an image is produced on the same side of the lens as the oject bu 61 cm away from the lens. What is (a) the focal length of the lens, (b) the size of the image?

An optical bench pointer 1 cm tall is placed at the 55 cm mark on a meter stick. When a diverging lens is placed at the 0 mark, an image is formed at the 5 cm mark. What is (a) the focal length of the lens, (b) the size of the image?

Thanks in advance (and no, this isn't homework, its from the book)

Ok, here goes.

A converging lens has a focal length of 20 cm. If it is placed 50 cm from an object, at what distance from the lens will the image be?

If an object is 10 cm from a converging lens of 5 cm focal length, how far from the lens will the image be formed?

An object 3.0 cm tall is placed 20 cm from a converging lens. A real image is formed 10 cm from he lens. What is (a) the focal length of the lens, (b) the size of the image?

When an object 5 cm tall is place 12 cm from a converging lens, an image is produced on the same side of the lens as the oject bu 61 cm away from the lens. What is (a) the focal length of the lens, (b) the size of the image?

An optical bench pointer 1 cm tall is placed at the 55 cm mark on a meter stick. When a diverging lens is placed at the 0 mark, an image is formed at the 5 cm mark. What is (a) the focal length of the lens, (b) the size of the image?

Thanks in advance (and no, this isn't homework, its from the book)