MCQOPTIONS
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				| 1. | 
                                    When light waves travel from air to glass, which variables are affected? [NDA] | 
                            
| A. | Wavelength, frequency and velocity | 
| B. | Velocity and frequency only | 
| C. | Wavelength and frequency only | 
| D. | Wavelength and velocity only | 
| Answer» E. | |