Question

1. When a ray (narrow beam of light) strikes a surface we measure and angle from a normal (perpendicular line) at the impact point. This angle is called the angle of? 2. What is the "Law of Reflection"? 3. Rays of light entering transparent media will change their direction. This bending of light is known as? 4. When a ray of light enters a transparent media like glass, we measure an angle inside the glass from a continuation of the normal outside. This angle is called the angle of? 5. It has been found that light entering transparent media changes it speed with respect to a vacuum measurement. The speed in the media is always ? then in a vacuum. 6. The ratio of the speed of light in a vacuum to that in a media is called the? 7. Write an expression for the ratio in question 6. 8. When light bends in a media an analytical relation between its angle outside and its angle inside is known as? 9. Write an expression for the relation in question 8? 10. Look over figure 32-24 in your text which shows a ray of light passing through thin flat glass. The direction of the ray on emerging from the glass is in the same direction it entered but it is slightly ? You will measure this in the experiment. 11. Fiber optics uses a phenomena known as "total internal_ _? 12. The angle of the approaching ray that causes the phenomena in question 11 is known as the " _? Angle". Which you will also measure in this experiment.

Answer 1

Incidence Reflected Ray in reflected Angle Incident Angle This angle is called incident Angle. 1 2 There are two laws of Reflection @ The incident Ray, The Reflected Ray and The normal drawn to the Reflecting Surface at the point of incidence, all Lie in the dame plane 6 The Angle of Incidence is equal to the Angle of Reflection = 28] The Bending of sight is called the e Refraction of Light". The angle is called Reflection" Angle of

6 the speed in the media is always den than is vaccuw tha e n speed of light in vaccum Speed of Light in reaction. So ispeed of Light - in readiun Speed of Linght in 6 The Pation of speed of light in a vacun to that in a media is called Refractive Index wheng n= Refractive Index C C = speed of light in Veen (V = speed of light in Media - n= c above explave it. & It called the Snell's sau which states that " The Relation between the angle of incidence and angle of refraction is constant and cour be defined as the Ratio of sin of Both angles that is angle of incidence to angle of Refraction.

@ m - Refractive Index.