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Question 1:

What is the primary function of the eyepiece in a compound microscope?

A) To hold the objective lenses
B) To illuminate the specimen
C) To magnify the image
D) To adjust the focus

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Explanation: The correct answer is C) To magnify the image. The eyepiece, also known as the ocular lens, is located at the top of the microscope and its primary function is to further magnify the image produced by the objective lenses. It typically provides a 10x magnification, and when combined with the magnification of the objective lenses, it allows for a higher total magnification of the specimen.

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Question 2:

What is the purpose of the stage in a compound microscope?

A) To hold the specimen
B) To focus the image
C) To adjust the light intensity
D) To change the objective lenses

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Explanation: The correct answer is A) To hold the specimen. The stage is a flat platform located below the objective lenses, and its purpose is to securely hold the specimen being observed. The stage typically has clips or mechanical stage controls to position and immobilize the specimen for observation and manipulation during microscopy.

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Question 3:

What is the role of the condenser in a compound microscope?

A) To hold the objective lenses
B) To illuminate the specimen
C) To focus the image
D) To adjust the magnification

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Explanation: The correct answer is B) To illuminate the specimen. The condenser is located beneath the stage and its primary role is to focus and concentrate the light onto the specimen. It helps provide a well-illuminated and evenly lit field of view, enhancing the visibility of the specimen under observation.

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Question 4:

What is the purpose of the objective lenses in a compound microscope?

A) To hold the eyepiece
B) To adjust the focus
C) To change the magnification
D) To hold the stage

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Explanation: The correct answer is C) To change the magnification. The compound microscope typically has multiple objective lenses, each with a different magnification power (e.g., 4x, 10x, 40x, 100x). These lenses are mounted on a rotating nosepiece and can be switched or rotated to select the desired level of magnification for observing the specimen. The objective lenses are responsible for capturing the initial magnified image of the specimen.

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Question 5:

What is the total magnification of a compound microscope when using a 10x eyepiece and a 40x objective lens?

A) 10x
B) 40x
C) 100x
D) 400x

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Explanation: The correct answer is D) 400x. The total magnification of a compound microscope is calculated by multiplying the magnification of the objective lens by the magnification of the eyepiece. In this case, a 10x eyepiece combined with a 40x objective lens results in a total magnification of 10x * 40x = 400x. This means that the specimen will appear 400 times larger than its actual size when observed through this microscope configuration.