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what is the focal length of a plane mirrior which is 4m tall?

Plane mirrors do not focus.

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Two converging lenses with the focal lengths of 40 cm and 20 cm are 10 cm apart. a 2.0-cm-tall object is 15 cm in front of the

Top answer: To solve this problem, we will first find the image formed by the first lens (40 cm focal length) Read more.
(1) A virtual image -7 cm tall and 17 cm away from a mirror is created by an object 7 cm away from a mirror. How tall is the

Top answer: (1) |(object size)/(image size)| = |(object distance)/(image distance)| (use absolute values above) Read more.
(1) A virtual image -7 cm tall and 17 cm away from a mirror is created by an object 7 cm away from a mirror. How tall is the

Top answer: duplicate post; already answered Read more.
A 6.00 cm tall candle is placed at a distance of 30.0 cm from a double convex lens having a focal length of 15.0 cm. How tall is

Top answer: To determine the height of the image formed by a lens, we can use the lens formula: 1/f = 1/v - 1/u Read more.
A 6.00 cm tall candle is placed at a distance of 30.0 cm from a double convex lens having a focal length of 15.0 cm. How tall is

Top answer: 6.00 cm Read more.
I was asked to compare my measured focal length to my calculated focal length. My calculated focal length I figured out by using

Top answer: The experimental values I have are: f=12 object location = 2.5f object distance from lens = 35 cm Read more.
A convex security mirror has a focal length of -0.25m. A person with a height of 1.5m is 4m from the mirror. calculate the image

Top answer: To calculate the image distance and image height in each scenario, we can use the mirror equation Read more.
If the thimble is 2.50 cm tall and has a focal length of 11.0 cm, how tall is the image of the thimble? What is its orientation?

Top answer: To determine the height and orientation of the image of the thimble, we can use the thin lens Read more.
What focal-length lens would you need to place next to a converging lens of focal length 29 cm to create an effective focal

Top answer: To determine the focal length of the lens that should be placed next to the converging lens to Read more.
determine the type and focal length of a lens that has the same power as a combination of a thin converging lens of focal length

Top answer: To determine the type and focal length of a lens that has the same power as the combination of a Read more.