ray3699

14.04.2021 • 

Physics

Imagine an object held at some height above the ground. It is released and falls toward the ground. Ignoring air resistance or friction, which of the following must be true? (1 point) Before it falls, all of its energy must be potential energy
At the end of its fall, all of its energy must be converted to kinetic energy
During its fall, the combination of its kinetic and potential energy must equal the amount of potential energy with which it started
Total energy = Kinetic Energy + Potential Energy
All of the above

Ответ:

ladybugys

29.05.2023

Physics

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The focal length of the lens is -5.88 cm.

Explanation:

We know that magnification in case of lenses is given by

where

'v' is the position of image

'u' is the position of the object

Since it is given that m = 0.4 thus we can write

Now the distance between the object and the image in case of concave lens is given by

Now by lens formula the focal length of the lens is given by

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