Please wait...
1800-212-7858 (Toll Free)
9:00am - 8:00pm IST all days


Thanks, You will receive a call shortly.
Customer Support

You are very important to us

For any content/service related issues please contact on this toll free number


Mon to Sat - 11 AM to 8 PM

CBSE - X - Physics - Light - Reflection and Refraction

why change in the speed of light when passing from a rarer to denser medium or vice versa makes it get bended?

Asked by Avi Wadhwa 5th January 2012, 9:59 PM
Answered by Expert


light is electromagnetic both electric and magnetic fld oscillatesperpendicular to each other as light the density of the medium changes, its speed also frequency of vibration remains same so the wavelength changes.
as we have seen when we drop a stone in a pond ri[pples will be produced...we can see that  all the points in circle around the point will vibrate in the same phase.
from huygen's principle we know that,point A and B onthe same wavefront, ie points having same phase of vibration. so when A is on the surface of another medium, B is still BD dist to go. by this time  A goes ac  dist in the other medium with some other speed . so AC will never be equal to BD. so point D and C will have same phase.from this concept only we can say that the path must bend to satisfy all the conditions.
Answered by Expert 6th January 2012, 10:09 AM

Rate this answer

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10

You have rated this answer /10

Report an issue
Your answer has been posted successfully!