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Chapter 33: Problem 2

Which one of the following is not a characteristic of a simple two-lens astronomical refracting telescope? a) The final image is virtual. b) The objective forms a virtual image. c) The final image is inverted.

Short Answer

Expert verified
a) The final image is virtual. b) The objective forms a virtual image. c) The final image is inverted. Answer: b) The objective forms a virtual image.

Step by step solution

01

Understanding a simple two-lens astronomical refracting telescope

A simple two-lens astronomical refracting telescope consists of two lenses: the objective lens and the eyepiece lens. The objective lens gathers the incoming light from a distant object and forms an image that is further magnified by the eyepiece lens for the observer to see. The objective lens is usually bigger and has a longer focal length, while the eyepiece lens is smaller with a shorter focal length.
02

Examining statement a: The final image is virtual

In a refracting telescope, the final image seen through the eyepiece is virtual. This means it cannot be projected on a screen, but only seen through the eyepiece. This is because the final image is formed by rays that appear to come from the point where the image is formed, but haven't actually passed through that point. Since the rays only appear to come from that point, the image is virtual. Statement a is true.
03

Examining statement b: The objective forms a virtual image

The objective lens of a refracting telescope gathers the incoming light from a distant object and forms a real, inverted image on its focal plane. This image is then further magnified by the eyepiece lens. Since the objective lens forms a real image, this statement is false.
04

Examining statement c: The final image is inverted

When light passes through the objective lens, it forms a real, inverted image on its focal plane. The eyepiece lens then further magnifies this already inverted image. As a result, the final image seen through the eyepiece of a simple two-lens astronomical refracting telescope will also be inverted. Statement c is true.
05

Conclusion

Based on the analysis of the statements, we can conclude that statement b ("The objective forms a virtual image.") is not a characteristic of a simple two-lens astronomical refracting telescope.

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Most popular questions from this chapter

A person with a near-point distance of \(24.0 \mathrm{~cm}\) finds that a magnifying glass gives an angular magnification that is 1.25 times larger when the image of the magnifier is at the near point than when the image is at infinity. What is the focal length of the magnifying glass?

You are experimenting with a magnifying glass (consisting of a single converging lens) at a table. You discover that by holding the magnifying glass \(92.0 \mathrm{~mm}\) above your desk, you can form a real image of a light that is directly overhead. If the distance between the light and the table is \(2.35 \mathrm{~m},\) what is the focal length of the lens?

To study a tissue sample better, a pathologist holds a \(5.00-\mathrm{cm}\) focal length magnifying glass \(3.00 \mathrm{~cm}\) from the sample. How much magnification can he get from the lens?

Jack has a near point of \(32 \mathrm{~cm}\) and uses a magnifier of 25 diopter. a) What is the magnification if the final image is at infinity? b) What is the magnification if the final image is at the near point?

A classmate claims that by using a \(40.0-\mathrm{cm}\) focal length mirror, he can project onto a screen a \(10.0-\mathrm{cm}\) tall bird locat ed 100 . \(\mathrm{m}\) away. He claims that the image will be no less than \(1.00 \mathrm{~cm}\) tall and inverted. Will he make good on his claim?
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