Tbr cbt#5 ps #24

[Kivi]

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What kind of images are possible using this apparatus?
A. Virtual, upright images
B. Real, inverted images
C. Virtual, inverted images
D. Real or virtual, upright or inverted images
D is the best answer. Apparatus 2 is a combination of a diverging lens and a converging lens. Diverging lenses always produce an upright, virtual image. Converging lenses, on the other hand, can produce either an upright, virtual image or an inverted, real image, depending on the position of the object. When considering combinations of multiple lenses, the image of the first lens serves as the object of the second lens. In Apparatus 2, the converging lens is the first lens, and the diverging lens is the second lens. Depending on the position of the object relative to the first lens, the first image (objective) can be inverted and real, or upright and virtual. The image produced by the diverging lens can fall almost anywhere and retains its upright or inverted orientation from the first lens. Any kind of image (real or virtual, upright or inverted) is possible with this lens combination. The final image depends on the placement of the object, on the distance separating the lenses, and on the focal lengths of the lenses. The best answer is D.


My question is that the 1st lens can produce either a Inverted, Real image or a Virtual Upright image.The diverging lens will retain its Upright or Inverted orientation - I get that but the answer says that UV, UR, IV, IR images are all possible but I can't seem to piece that together.

How does this system produce a Upright Real image and a Inverted Real image?



any help would be greatly appreciated - thanks!

 

[MedPR]

What kind of images are possible using this apparatus?
A. Virtual, upright images
B. Real, inverted images
C. Virtual, inverted images
D. Real or virtual, upright or inverted images
D is the best answer. Apparatus 2 is a combination of a diverging lens and a converging lens. Diverging lenses always produce an upright, virtual image. Converging lenses, on the other hand, can produce either an upright, virtual image or an inverted, real image, depending on the position of the object. When considering combinations of multiple lenses, the image of the first lens serves as the object of the second lens. In Apparatus 2, the converging lens is the first lens, and the diverging lens is the second lens. Depending on the position of the object relative to the first lens, the first image (objective) can be inverted and real, or upright and virtual. The image produced by the diverging lens can fall almost anywhere and retains its upright or inverted orientation from the first lens. Any kind of image (real or virtual, upright or inverted) is possible with this lens combination. The final image depends on the placement of the object, on the distance separating the lenses, and on the focal lengths of the lenses. The best answer is D.


My question is that the 1st lens can produce either a Inverted, Real image or a Virtual Upright image.The diverging lens will retain its Upright or Inverted orientation - I get that but the answer says that UV, UR, IV, IR images are all possible but I can't seem to piece that together.

How does this system produce a Upright Real image and a Inverted Real image?



any help would be greatly appreciated - thanks!

I don't think the answer says you can have an upright real image, it just says you can have an upright image, or a real image, or an inverted image, or a virtual image. It doesn't necessarily combine all of them.

For inverted real, however, if you put the object outside the radius of curvature, the converging lens will produce an inverted, real image.

 

[Kivi]

It is asking for the final image so the 1st image made by the converging lens wouldn't count

Also how can you get a Real image from a diverging lens? You can't

 

[MedPR]

It is asking for the final image so the 1st image made by the converging lens wouldn't count

Also how can you get a Real image from a diverging lens? You can't

Where does it say "final image"? The first lens produces an image regardless of what the second lens does with that image. If it was asking for the final image only, the answer would be upright & virtual only because diverging lenses always produce upright & virtual images.

This is probably one of the simplest multi-lens questions you'll ever see assuming that you don't complicate it yourself. All it's asking is "What kinds of images can be produced by converging lenses? What kinds of images can be produced by diverging lenses?"

Then, it doesn't even complicate the answer choices. For example, the answer choices aren't "real and inverted, real and upright, virtual and inverted, virtual and upright, virtual inverted, larger, etc" It just asks if it is possible for lenses to create real images, virtual images, upright images, and inverted images.

 

[Kivi]

Where does it say "final image"? The first lens produces an image regardless of what the second lens does with that image. If it was asking for the final image only, the answer would be upright & virtual only because diverging lenses always produce upright & virtual images.

This is probably one of the simplest multi-lens questions you'll ever see assuming that you don't complicate it yourself. All it's asking is "What kinds of images can be produced by converging lenses? What kinds of images can be produced by diverging lenses?"

Then, it doesn't even complicate the answer choices. For example, the answer choices aren't "real and inverted, real and upright, virtual and inverted, virtual and upright, virtual inverted, larger, etc" It just asks if it is possible for lenses to create real images, virtual images, upright images, and inverted images.

Diverging lenses always retain object orientation and are always virtual. So if you have an Inverted, Real object, the diverging lens can produce an Inverted Virtual image..... 🙄 So depending on the orientation of your object, diverging systems can produce Inverted Virtual or Upright Virtual.

Yeah you're right, it wasn't asking about final image and that makes it a bit more clear

I don't think I was complaining that this is a hard question or confusing, I just wanted to understand how a combination of lenses work in more detail. I think the major takeaway is that diverging systems retain object orientation and are virtual - not just upright and virtual b/c that only applies to upright real objects.

 

[MedPR]

Diverging lenses always retain object orientation and are always virtual. So if you have an Inverted, Real object, the diverging lens can produce an Inverted Virtual image..... 🙄 So depending on the orientation of your object, diverging systems can produce Inverted Virtual or Upright Virtual.

Yeah you're right, it wasn't asking about final image and that makes it a bit more clear

I don't think I was complaining that this is a hard question or confusing, I just wanted to understand how a combination of lenses work in more detail. I think the major takeaway is that diverging systems retain object orientation and are virtual - not just upright and virtual b/c that only applies to upright real objects.

Yea, what you wrote about diverging lenses is pretty important imo. If the image produced by the converging lens is inverted, the diverging lens will produce an inverted image relative to the first object. But since the first image is technically the object for the diverging lens, the image produced is "upright" because, as you say, it is the same orientation as the object.