# physics (mirror 2)

posted by .

A pin is placed 40cm away from a convex lens of focal lenght 20cm. Determine the maginification of the pin formed by the lens.

m = 40/20 = 2

am i right with this?

• physics (mirror 2) -

You have f, and do

1/do + 1/di = 1/f

di=dodf/(do+df)=800/60

M= do/di

check my thinking.

## Similar Questions

1. ### Physics: Lenses

1) A convex lens with a focal lenght of 4.0cm is placed 20.0cm from a concave lens with a focal lenght of 5.0cm. Find the position of the image when the object is placed 12.0c, in front of the convex lens. 2) A double concave lens …
2. ### physics

A 5.0-cm real object is placed at a distance of 30.0 cm from a concave mirror of focal length 10.0 cm. Find the location of the image. A. 6 cm B. 10 cm C. 15 cm D. 60 cm Is it B. 10 cm?
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. ### Physics

An object is placed 30mm in front of a lens. An image of the object is located 90mm behind the lens. a) Is the lens converging or diverging?
5. ### 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 …
6. ### Physics

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

Because a concave lens cannot form a real image of a real object, it is difficult to measure its focal length precisely. One method uses a second, convex, lens to produce a virtual object for the concave lens. Under the proper conditions, …
8. ### Physics

An object 20cm high is placed 40cm from a lens of focal length 24cm. Calculate: a) The power of the Lens?
9. ### physics

A convex lens with a focal length of 20 cm is placed in front of a convex mirror with a focal length of 7.5 cm. A luminous object is placed in front of the convex lens at a distance of 40 cm from it. What is the distance between the …
10. ### physics

A pin 2 cm long is placed 12 cm away from a convex lens at right angles to the principal axis. If the focal length of the lens is 20 cm, by scale drawing and lens formula find the nature , size and position of image.

More Similar Questions