Question

Which of the following could be the possible causes for a student observing a dark spot through a microscope that does not move when the slide is moved?

A) The microscope lens is dirty or smudged.
B) The specimen on the slide is not properly positioned.
C) The microscope is not properly focused.
D) The light source of the microscope is not functioning.
E) The microscope slide is cracked or damaged.
F) The student's eyesight is impaired.

Answer 1

The possible cause for a student observing a dark spot through a microscope that does not move when the slide is moved could be The specimen on the slide is not properly positioned. (option B)

Step-by-step explanation:

A dark spot that remains stationary when the slide is moved suggests that the issue may be related to the positioning of the specimen. If the specimen is not correctly placed under the microscope objective, it can lead to an unchanging image. This could occur if the specimen is not centered or if it is not within the field of view of the microscope.

Other options such as a dirty lens (A), improper focus (C), non-functioning light source (D), a cracked slide (E), or impaired eyesight (F) are more likely to result in a blurry image, distorted view, or overall difficulty in visualizing the specimen, rather than a specific dark spot that remains static.

Ensuring the proper positioning of the specimen on the slide is crucial for obtaining a clear and dynamic image through the microscope, addressing the issue of a stationary dark spot during observation.