Refraction is an effect that occurs when a light wave, incident at an angle away from the normal, passes a boundary from one medium into another in which there is a change in velocity of the light. Light is refracted when it crosses the interface from air into glass in which it moves more slowly. Since the light speed changes at the interface, the wavelength of the light must change, too. The wavelength decreases as the light enters the medium and the light wave changes direction. We illustrate this concept in Figure 3 by representing incident light as parallel waves with a uniform wavelength . As the light enters the glass the wavelength changes to a smaller value '. Wave "a" passes the air/glass interface and slows down before b, c, or d arrive at the interface. The break in the wave-front intersecting the interface occurs when waves "a" and "b" have entered the glass, slowed down and changed direction. At the next wave-front in the glass, all four waves are now traveling with the same velocity and wavelength
Answer:
The correct answers are -
A. Find the absolute age of rocks at both locations.
B. Compare a layer at one location to layers at other locations
C. Identify index fossils in one or more layer at one location.
Explanation:
A scientist who studied the earth and different aspects such as it's structure and the materials it made if up known as a geologist. Classifying rocks and discovering various components and matter on earth are the major duties of a geologist.
At some point, rocks can be located at a distance beyond the reach of geologists. Nevertheless, they have a way of studying, and comparing the layers of those rocks helps them to understand the basic difference in the earth locations and the presence of certain components of earth.
Comparing rocks and layers can include these steps at first by geologists-
A. Find the absolute age of rocks at both locations.
B. Compare a layer at one location to layers at other locations
C. Identify index fossils in one or more layer at one location.
