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CBASE Science - Reviews


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Based on 140 reviews


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Exam Edge is an industry leader in online test prep. We work with institutional partners to offer a wide array of practice tests that will help you prepare for your big exam. No matter how niche your field of interest might be, we are here to help you prepare for test day.



See why our users from 154 countries love us for their exam prep! Including 140 reviews for the CBASE Science exam.

Exam Edge is an industry leader in online test prep. We work with institutional partners to offer a wide array of practice tests that will help you prepare for your big exam. No matter how niche your field of interest might be, we're here to help you prepare for test day.

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CBASE Science - Test Reviews Sample Questions

In a compound microscope, what is the intermediate image?

Correct Answer:
real, inverted, and magnified


in a compound microscope, the intermediate image plays a crucial role in the magnification process. this intermediate image is created by the first lens of the microscope, known as the objective lens. the objective lens is positioned very close to the object being viewed, and its primary function is to capture light from the object and create a magnified image of it.

the object is strategically placed just outside the focal point of the objective lens. as a result, the light rays coming from the object are bent by the objective lens and converge at a point to form an image. this image is real, meaning it can be projected onto a screen, inverted, implying it is upside-down relative to the object, and magnified, indicating that it is larger than the original object.

this intermediate image serves as the object for the second lens in the microscope, known as the eyepiece or ocular lens. the eyepiece further magnifies this image. however, the primary feature of the intermediate image—that it is real, inverted, and magnified—is crucial as it determines how the final image will appear to the viewer through the eyepiece. the eyepiece typically magnifies this intermediate image further and also corrects its orientation so that it appears erect to the viewer.

thus, the intermediate image in a compound microscope is an essential step in achieving the high levels of magnification that are characteristic of this type of microscope. it allows for detailed examination of minute structures at a scale convenient for human observation and study, which is fundamental in fields such as biology and materials science.

A telescope has an objective of focal length of 100 cm, and an eye-piece of focal length of 5 cm. What is the magnifying power of the telescope when both the object and the image are at infinity?

Correct Answer:
20


0.2 the magnifying power of a telescope is typically evaluated under the condition known as "normal adjustment," where the object being observed (e.g., a distant star) is effectively at infinity. this aligns with how telescopes are commonly used in astronomical observations, where the celestial bodies are so far away that they can be considered infinitely distant. when the object is at infinity, the image formed by the objective lens (the primary lens of the telescope) is also at the focal point of the objective lens.

0.2 in this particular scenario, the telescope consists of an objective lens with a focal length (f_o) of 100 cm and an eyepiece with a focal length (f_e) of 5 cm. the magnifying power (m) of the telescope in normal adjustment can be calculated using the formula m = f_o / f_e. this formula derives from the basic principles of optics, where the magnifying power is the ratio of the focal lengths of the objective lens to the eyepiece.

0.2 substituting the given values into the formula gives m = 100 cm / 5 cm = 20. this means that the telescope magnifies the image by a factor of 20. in practical terms, this magnification allows objects at great distances to appear 20 times closer or 20 times larger in angular size than they would to the naked eye. this capability is particularly useful in astronomy for observing details in celestial objects that would otherwise be too small to see unaided.