Exam-style question
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What limitation does diffraction impose on the performance of an astronomical telescope?.
- A.It decreases the amount of light collected
- B.It causes blurring of the image
- C.It increases the size of the telescope
- D.It affects the color accuracy of the image
Model answer
What a good answer should say
- It causes blurring of the image
Explanation
Why this works
Diffraction occurs when light waves encounter obstacles, such as the edges of the telescope's aperture, leading to a spreading of light and blurring of the image. This limitation affects the resolving power of the telescope, making it difficult to distinguish between closely spaced objects.
Understanding this effect is crucial for improving telescope design and achieving clearer images.
Common mistake
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