Answer:
The first of the basic laws of geometric optics is the law of rectilinear propagation of light. It reads: in an optically homogeneous medium the ray of light propagates in a direction.
Here are 5 advantages of buying a car: Paying less over the long term. Monthly lease payments are generally less expensive than monthly car loan payments. However, with each loan payment, you can build up equity for the future when you decide to sell it or trade it in.
Worker productivity is one of the most important factors that help determine the performance of an economy. per capita GDP best describes productivity. This is further explained below.
<h3>What is GDP?</h3>
Generally, Final products and services—i.e., those purchased by consumers—are included in GDP, which estimates the value of goods and services produced in a specific period of time.
In conclusion, One of the most critical determinants of an economy's health is the productivity of its workforce. per head of population, Productivity is best described by GDP.
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The correct answer is - B) the water quality of the stream.
By studying the fish populations and their well being, the watersheds, as well as the composition of the water, the scientists are trying to keep track of the situation of the quality of the water in the stream.
The fish populations, their activity, well being, are always a nice indicator about the water quality, as they live in it and are directly effected by any negative changes in the water quality.
The watersheds can also show a partial picture of the quality of the water in the streams, and that is because the water passes through them before entering the stream itself, so a clean and healthy watershed, often means good quality of the water.
The most relevant indicator of the quality of the water in the stream is still the testing of the water itself, where the water composition can be examined in detail thus to be determined its condition.
