Chapter 1: Lesson 2 Flashcards
_____ are instruments used by scientists to make observations, take measurements, and conduct experiments. These instruments are grouped according to their use. Knowledge about these tools will help you conduct your own experiments in the near future.
Scientific tools
Human senses have limitations and cannot be completely relied on to provide accurate and precise information. Thus, you need to use specialized tools to extend the capability of your senses and improve your observations of objects that are extremely small or distant. Some of the common _____ are the telescope, magnifying glass, and microscope
observing tools
A ____ is an instrument used for viewing distant objects such as the moon and the stars.
telescope
The telescope is said to have been invented by ______ (1570-1619), who applied for a patent for the device in 1608. According to Lippershey, the device, which has a _____ aligned with a _____ can magnify distant objects three times. The telescope works by ____ the image of distant objects through the use of mirrors and lenses.
Hans Lippershey,
concave eyepiece,
convex objective lens,
magnifying
There are two types of telescopes. These are the _____ and the _______.
reflecting telescope,
refracting telescope
The _______ uses a parabolic mirror to collect and focus the parallel light rays coming from distant objects such as celestial objects.
reflecting telescope
The _____, on the other hand, uses lenses to gather more light than what can be absorbed by the human eye. These lenses are the objective lens and the eyepiece lens, which make objects from afar look brighter, clearer, and magnified.
refracting telescope
The magnifying glass or the _____ was invented by ____ (1214-1294), a lecturer at Oxford University in England.
handheld lens,
Sir Roger Bacon
It is a device that is used to view small or minuscule objects. Most _____ use _____ that allow light rays to bend toward the center of the lens. When the magnifying glass is placed close to an object, the object looks larger than what it appears to be to the human eye. The magnification of a magnifying glass is determined by its distance from the object being viewed.
magnifying glasses,
A ______, which is believed to have been invented by _____ and _____ (1585-1632), is a device that allows you to see enlarged images of very small objects.
microscope,
Hans Janssen,
Zacharias Janssen
Like the magnifying glass, the microscope makes use of ____. As you look through the eyepiece, the light from the object that you are looking at is bent or refracted toward your eye, making the object look bigger.
convex lenses
-There are different types of miroscopes. The most common of these is the _____.
-A _____ uses two convex lenses with short focal lengths. When you look into the eyepiece, you will see that the object is magnified and inverted at the same time.
-A ____ has a magnification of 1000x
compound microscope
A _____ is a lens that is thinner at the center.
A _____ is a lens that is thicker at the center.
concave lens,
convex lens
____
In baking, you need to use the exact amount of ingredients so that cakes and pastries turn out well. A slight difference in the measurement of the ingredients may result in products of different taste, color, texture, or fluffiness. The same is true in doing science experiments. You cannot just guess the amount of substances that you will mix or the measurements of the materials that you will prepare. The measurements have to be exact for you to get accurate results. To do this, you need to use standard measuring tools. The following are some common examples.
Measuring Tools
A ____ and a _____ are tools for measuring the lengths or widths of objects or the distance of one object to another. These measuring devices may be made of wood, metal, or plastic.
meterstick,
ruler
