A 2.26 cm tall object is placed in 18.6 cm in front of a convex lens. The focal length
1 answer:
Answer:
the image is -38.7 cm from the lens
Explanation:
We use the lens equation which says
where is the distance to the object,
is the distance to the image, and
is the focal length.
Now, in our case
,
,
;
therefore,
where the negative sign indicates that the image is virtual and on the same side of the lens as the object.
You might be interested in
The elastic potential energy of a spring is given by
where k is the spring's constant and x is the displacement with respect to the relaxed position of the spring.
The work done by the spring is the negative of the potential energy difference between the final and initial condition of the spring:
In our problem, initially the spring is uncompressed, so
. Therefore, the work done by the spring when it is compressed until 
is
And this value is actually negative, because the box is responsible for the spring's compression, so the work is done by the box.
where k is the spring's constant and x is the displacement with respect to the relaxed position of the spring.
The work done by the spring is the negative of the potential energy difference between the final and initial condition of the spring:
In our problem, initially the spring is uncompressed, so
And this value is actually negative, because the box is responsible for the spring's compression, so the work is done by the box.