Home › CBSE Class 10 › Science › Light - Reflection and Refraction › A ray of light travels from air into a glass sla…
A ray of light travels from air into a glass slab. Which of the following changes is correct?
ASpeed and wavelength both decrease
BSpeed decreases, frequency decreases
CWavelength increases, speed increases
DFrequency increases, speed decreases
Answer & Solution
Correct answer: A. Speed and wavelength both decrease
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_
Related questions
A convex lens of focal length 20 cm has an object placed at 30 cm from it. The image distaAn object placed at the focus of a concave mirror produces an image:Total internal reflection occurs when light travels from:The lens formula for a thin lens is:A convex lens of focal length 25 cm has power equal to:Power of a lens of focal length f (in metres) is given by:Snell's law of refraction is:The refractive index of a transparent medium is defined as: