sancho7511
24.07.2019 •
Physics
Which information is necessary to determine an object's speed? a. distance and period of time b. distance and change in position c. period of time and direction d. distance and direction
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Ответ:
So A.)
Ответ:
Focal length, f = 10 cm
Explanation:
We have,
A concave mirror forms a real image at 15.0 cm from the mirror surface along the principal axis, it means that the image distance is 15 cm
The object is placed at a distance of 30 cm, u = -30 cm
It is required to find the focal length of the mirror. Let it is f. Using mirror's formula to find it:
So, the focal length of the mirror is 10 cm.