When a wave enters a denser medium from a rarer medium, its speed decreases and wavelength decreases, while frequency does not change. Light entering water from air experiences refraction, unless the incident ray is perpendicular to the medium, in which case refraction does not occur. When the incident angle is greater than the critical angle, total internal reflection occurs. The glitter of diamonds is due to multiple internal reflections and refractions within the diamond. The angle of refraction depends on the refractive index of the material. Mirages can occur on roads due to the deformation of light rays, and the sun can be visible even when below the horizon due to refraction in the atmosphere.

3. SCIENCE BEHIND THE SHIFT

5. WHEN A WAVE ENTERS A DENSER MEDIUM FROM A RARER MEDIUM, ITS………. SPEED DECREASES WAVE LENGTH DECREASES PART OF THE WAVE IS REFLECTED FREQUENCY DOES NOT CHANGE

14. LIGHT ENTERING WATER FROM AIR

17. WHEN THE INCIDENT RAY IS PERPENDICULAR TO THE MEDIUM, REFRACTION DOES NOT TAKE PLACE

21. WHEN i > ø c , TOTAL INTERNAL REFLECTION OCCURS CRITICAL ANGLE

22. THE GLITTER OF DIAMOND IS DUE TO MULTIPLE INTERNAL REFLECTIONS AND REFRACTIONS

23. ANGLE OF REFRACTION DEPENDS ON THE REFRACTIVE INDEX

24. REFRACTIVE INDEX OF A MATERIAL, n …..

32. MIRAGE

33. MIRAGES ON ROADS

34. DEFORMATION OF SOLAR DISC

35. SUN IS VISIBLE EVEN WHEN IT IS BELOW THE HORIZON