CUET Preparation Today
When light passes from air to glass, then |
its wavelength increases and velocity decreases. its wavelength and velocity both decrease. its wavelength decreases but velocity increases. its wavelength and velocity both increase. |
its wavelength and velocity both decrease. |
The correct answer is Option (2) → its wavelength and velocity both decrease. When light enters from air (rarer medium) to glass (denser medium): → The speed of light decreases because refractive index of glass is greater than that of air. → Frequency remains constant. → Since $v = \nu \lambda$, and $\nu$ is constant, a decrease in velocity causes wavelength to decrease. ∴ Correct answer: its wavelength and velocity both decrease. |
