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A ray of light travels from air into a glass slab. Which of the following changes is correct?
Answer & Solution
Correct answer: A.
1. When light enters a denser medium, its speed decreases.
2. Frequency stays the same; wavelength shortens (v = fλ).
3. Hence both speed and wavelength decrease together.
_Source: NCERT Class 10 Science, Ch 9 "Light Reflection and Refraction", §9.3.1_
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