Reflecting telescope

High school (ages 12+)
Science & Technology

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Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/reflecting-telescope

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the primary optical principle?Reflection of light by curved mirrors
2. What is the key historical development?Isaac Newton's invention in the 17th century to overcome chromatic aberration
3. Why do reflecting telescopes use mirrors instead of lenses?Mirrors don't bend light the way lenses do, so they don't create color fringing or blurry images. Because of this, reflecting telescopes can show sharper pictures of space.
4. How did Isaac Newton help make better telescopes?Isaac Newton made the first good reflecting telescope in the 1660s. He used a curved mirror instead of a lens, which stopped the color blur and let the telescope see dim stars better.

Catoptric Telescope: An alternative name for a reflecting telescope, emphasizing its use of mirrors.
Spherical Aberration: An optical defect where light rays hitting different parts of a spherical mirror focus at different points.
Grazing Incidence: The angle at which X-rays or other high-energy radiation strike a mirror, allowing for reflection rather than absorption.