Question

When light enters glass from vacuum then the wavelength of light

• A. remains constant
• B. becomes zero
• C. decreases
• D. increases

Hint:

On refraction, frequency remains unchanged; speed and wavelength change.

Answer 1

The Correct Option is C

Step 1: Identify quantities that change on refraction.
When light enters a denser medium, its speed decreases while frequency remains constant.
Step 2: Use relation between speed, wavelength and frequency.
\[ v = f\lambda \]
Step 3: Compare vacuum and glass.
Since frequency \( f \) remains same and speed \( v \) decreases in glass, wavelength must decrease.
Step 4: Conclusion.
The wavelength of light decreases on entering glass.