"Microscope and Telescope" Lens and its Application PPT Courseware 4

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"Microscope and Telescope" Lens and its Application PPT Courseware 4

Activity 1: Read this section on page 103 of the microscope textbook and think about the following questions (1 minute for independent thinking, 2 minutes for group discussion)

1. What is the structure of a microscope?

2. What is the principle of microscope? (Hint: Where is the image of the objective lens? What is the role of the eyepiece?)

3. What images are formed through the eyepiece and objective lens?

2.Microscope

Objective: A convex lens close to the object being observed

an inverted enlarged real image

Eyepiece: Convex lens near the eye

upright enlarged virtual image

Question: Does the microscope look like it’s upside down or upright?

Activity 2: Use the telescope to read this part of the textbook on pages 103-104 and think about the following questions (1 minute for independent thinking and 2 minutes for group discussion)

1. What is the structure of the telescope?

2. How does a telescope work? (Hint: Where is the image of the objective lens? What is the role of the eyepiece?)

3. What does the size of the viewing angle relate to?

biconvex lens

Objective lens: an inverted, reduced real image

Eyepiece: creates an upright magnified virtual image

Question: Does the telescope look like it is upright or upside down?

[Typical example] Both microscopes and telescopes are composed of two sets of lenses: eyepieces and objective lenses. The imaging principle of the magnifying glass is the same.

A. The eyepiece of a microscope and the objective lens of a telescope

B. Microscope eyepiece and telescope eyepiece

C. Microscope objective lens and telescope eyepiece

D. Microscope objective lens and telescope objective lens

[Analysis] Select B. This question examines the principles of microscopes and telescopes. The function of the objective lens in the microscope is to obtain a magnified real image, which is the same as the imaging principle of the projector (or slide projector) learned earlier, and the function of the eyepiece is to re-magnify this real image. The magnified virtual image obtained by magnification is the same as the imaging principle of a magnifying glass; the objective lens in a telescope is used to observe distant objects. When the object is beyond 2 times the focal length, an inverted and reduced real image is obtained. The imaging principle is the same as that of a camera. The eyepiece captures this The reduced real image is enlarged to obtain the enlarged virtual image, that is, the imaging principle of the eyepiece in the telescope is the same as that of the magnifying glass; therefore, the correct answer is B.

1. The microscope commonly used in biology classes can magnify small objects at high magnification. It uses two convex lenses with different focal lengths as the objective lens and eyepiece respectively. Then the image formed by the objective lens and the eyepiece on the observed object ( )

A. The objective lens forms an inverted, magnified real image

B. Both the objective lens and the eyepiece form a real image

C. Both the objective lens and the eyepiece become virtual images

D. The eyepiece forms an inverted, magnified virtual image

2. The following sets of data are the magnifications of the objective lenses and eyepieces of four microscopes. Among them, the microscope with the largest magnification is ( )

A.16 times, 5 times B.10 times, 10 times

C.15 times, 6 times D.18 times, 4 times

3. Which of the following statements about telescopes is correct ( )

A. The objective lens and eyepiece are both equivalent to a magnifying glass

B. It must be composed of two sets of convex lenses

C. What you see through the eyepiece is like a magnified virtual image

D. The images formed by the objective lens and eyepiece of the telescope are both real images.

4. Among the following statements about perspective, which one is correct ( )

A. The larger the viewing angle, the clearer the objects we see.

B. The smaller the viewing angle, the clearer the objects we see

C. If the viewing angle is too large or too small, we cannot see the object clearly

D. The size of the visual angle has nothing to do with whether we can see the object clearly

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Update Time: 2024-10-02

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