# physics

posted by .

In order to clearly read a book 16 cm away, a farsighted girl needs an image to be 36 cm from her eyes. What focal length is needed for the lens in her eyeglasses?

• physics -

28.56

## Similar Questions

1. ### Physics

An optometrist has perscribed you 2D glasses. This means a) you are farsighted and the focal lenght of your glasses lens is +.5m b)you are nearsighted and the focal lenght of your glasses lens is +.5m c)you are farsighted and the focal …
2. ### Science Important

1. A toy of height 18.4 cm is balanced in front of a converging lens. An inverted, real image of height 33 cm is noticed on the other side of the lens. What is the magnification of the lens?
3. ### Physics

An image of a candle is produced by a convex lens 14 cm away. If the focal length of the lens is 7 cm, how far from the lens is the candle placed?
4. ### calculus problem

the thin lens equation in physics is 1/s+1/S=1/f where s is the object distance from the lens,S is the image distance from the lens,and f is the focal length of the lens.Suppose that a certain lens has a focal length of 6cm and that …
5. ### Physics

Camera lenses are described in terms of their focal length. A 50.0 mm lens has a focal length of 50.0 mm (a) A camera with a 50 mm lens is focused on an object 4.0 m away. Locate the image. (b) A 980 mm lens is focused on an object …
6. ### physics

A box is placed 50 cm away from a double convex lens. The image is on the opposite side of the lens, is inverted and 50 cm away from the lens. find: a)the focal length of the lens. b)the height of the image. c) using the focal length …
7. ### physics

A converging lens is 50cm away from the object. if the distance of the image from the object is 120cm and greater than four times the focal length of the lens, what is the focal length of the said lens?
8. ### Physics

i have a question on thin lens equation how do i know when di is positive or negative?
9. ### physics

A camera with a lens of focal length 10 cm takes a picture of a 160 cm girl standing 24.0 m away. What is the approximate height of the image?
10. ### Physics HELP

You have a converging (convex) lens and a diverging (concave) lens and the magnitude of the focal length of each lens is 38.5 cm. (a) Determine which lens you should use in order to produce an image of a light bulb on a screen several …

More Similar Questions