An earthquake's epicenter is the place on earth's surface directly above the focus.
reason : the epicenter lie above the focus where the disturbance starts.
when an earthquake occurs, energy radiates in all directions from its source, which is called the focus
reason : because the disturbance starts from the focus below the epicenter.
earthquakes are usually associated with faults
reason : earthquake arise from the disturbance or faults of the plates of the earth inside.
Springs in series will experience the same force all throughout and the elongation will add up. Springs in parallel will experience different forces and the elongation will be the same for each. The ranking will be from lowest to highest:
Case 3
Case 2
Case 1
Case 4
Case 5
To solve this problem we will apply the concept of magnification, which is given as the relationship between the focal length of the eyepieces and the focal length of the objective. This relationship can be expressed mathematically as,
Here,
= Magnification
= Focal length eyepieces
= Focal length of the Objective
Rearranging to find the focal length of the objective
Replacing with our values
Therefore the focal length of th eobjective lenses is 27.75cm