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 caled 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 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 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 ? 10. Look over figure 32-24 in your text which shows a ray of light passing through thin flat class. The direction of the rayon 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.

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Answer 1

(1) It is called angle of incidente Oin Ora Angle of incident Angle of Reflection Loi Op. Muruh ол Q According to law of Reflection, angle of incidence is always equal to angle of reflection oi = OR And incident ray reflected ray and normal to surface all lie in same plane. 3) This is known as Refraction O i and on nais n med " (5) Angle of refraction a The speed is always sheed in vaccum. on less than the

(6) Referactive Referactive (1) index of medium inden of medium is given by speed of light in vaccumm a c Skeed of light in medium nosll - Vn nos ll= 3x108 um (8) (9) Snell's law nisiner = of Refraction. no sinon displaced from Do It is slightly original bath Total Internal Reflection Critical angle

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