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"Magical Eyes" Colorful Light PPT Courseware 4
Review the past and learn the new
①Magnifying glass
②Microscope
Optical microscope: The focal length of the objective lens is very small. When the specimen is between one focal length and twice the focal length, a magnified inverted real image is formed through the objective lens; this image is within one focal length of the eyepiece, and an upright magnified virtual image is formed through the eyepiece. If the objective lens magnifies the specimen by a times and the eyepiece magnifies the image it receives by b times, then the magnification of the specimen by this microscope is ab.
③Telescope
④Camera
⑤Projector
Apply what you learn
1. The objective lens and eyepiece of a microscope are both convex lenses. The specimen passes through the objective lens and forms a __________ image; this image forms a ___________ image in the eyepiece, which forms an __________ image through the eyepiece. If the magnification of the objective lens and eyepiece are n1 and n2 respectively, then the magnification of the microscope is _____.
2. When Teacher Zhang used a projector to show slides, a normal picture appeared on the screen. This was a small bug that happened to land on the lens of the convex lens. The impact on the picture at this time was ( )
A Almost no impact B There is a bug on the screen
C There are bugs on the screen but it is not clear. D The screen becomes blurry.
3. Xiao Ming and Xiao Hong use the same camera with the same focal length to take pictures of Xiao Qiang. The developed negatives are A and B respectively, then ( )
A Xiaohong is close to Xiaoqiang
B Xiao Ming and Xiao Hong are at the same distance from Xiao Qiang
C. Xiaohong wants to make the image on the film as big as Xiaoming's. Xiaohong should be closer to Xiaoqiang, and then reduce the distance between the lens and the film.
D. Xiao Hong wants to make the image on the film as big as Xiao Ming's. Xiao Hong should be closer to Xiao Qiang, and then increase the distance between the lens and the film.
4. When using the projector shown on the right for projection, the image on the screen is smaller, so the correct adjustment method is ____________.
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"Magical Eyes" Colorful Light PPT Courseware 3:
"Magical Eyes" Colorful Light PPT Courseware 3 Two convex lenses with the same diameter, their focal lengths are 8cm and 16cm respectively. Which lens deflects light more? What conclusions can you draw from this? Then check the concave and convex degree of the lens, you can also get...
"Magical Eyes" Colorful Light PPT Courseware 2:
"Magical Eyes" Colorful Light PPT Courseware 2
What are the rules of imaging by convex lenses?
When u>2f, it becomes an inverted, reduced, real image, and the image and the object are on opposite sides of the lens.
when f
"Magic Eyes" colorful light PPT courseware:
"Magical Eyes" Colorful Light PPT Courseware Two convex lenses with the same diameter, their focal lengths are 8cm and 16cm respectively. Which lens deflects light more? What conclusions can you draw from this? Then check the concave and convex degree of the lens, you can also get...