Refraction of Light 1. Briefly describe what happens when a light ray travelling from air to a glass block that is parallel-sided (displaced laterally)? There shall appear an emergent ray instead of refracted ray Incident ray is parallel to the emergent ray The angle of incidence is equal to the angle of emergence None of the above Question 1 of 36 2. Will refraction occur when a ray of light travels perpendicular to the interface from one medium to another? Yes No Maybe None Question 2 of 36 3. Define Snell's Law The angle of incidence is equal to the angle of refractionThe angle of incidence is equal to the angle of emergent ray The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant for a given pair of media.none of the above Question 3 of 36 4. Is the following formula correct when comparing velocity of light rays between 2 media: n1V1 = n2V2 ? true false maybe none Question 4 of 36 5. Is it possible for a ray of light to have an angle of refraction less than 90 degrees? Yes No Maybe None of the above Question 5 of 36 6. Define Lateral displacement It is the refraction of light from glass to air When a light ray travelling from air to a glass block that is parallel sided, the direction of light is not altered but it is displaced sideways. D = t x sin (i - r)/cos rAll of the above Question 6 of 36 7. Vertical displacement is the difference between real depth and apparent depth? False True Maybe None Question 7 of 36 8. Define absolute refractive index? This is the refractive index for a ray travelling from vacuum to a medium Reflection of light in vacuum Refraction of light in vacuum None of the mentioned Question 8 of 36 9. Which of the following medium do you expect a greater refraction? Vacuum Denser medium Less dense medium None of the above Question 9 of 36 10. Define critical angle The angle of refraction for which the angle of incidence in air is 90 degreesThe angle of incidence for which the angle of refraction in air is 45 degreesThe angle of incidence in a denser medium (i.e glass) for which the angle of refraction in a less dense medium (i.e air) is 90 degreesNone of the mentionedQuestion 10 of 36 11. Give the refractive index for a ray of light travelling from medium 1 to 2? sin i/ sin r (sin r/ sin i) = nsin i/ sin r = 1n2(sin r/ sin i) = 1n2Question 11 of 36 12. Define the refractive index in terms of velocity 1n2 = (velocity of light in vacuum)/(velocity of light in medium 1)n= (velocity of light in medium 1)/(velocity of light in medium 2) 1n2= (velocity of light in medium 1)/(velocity of light in medium 2) none of the above Question 12 of 36 13. Which of the following medium do you expect a weak refraction? Vacuum Denser medium Less dense medium None of the above Question 13 of 36 14. Vacuum has a refractive index of 1? False True Maybe None Question 14 of 36 15. Refraction is the bending of light at the interface when it travels from one medium to another? True False Maybe None Question 15 of 36 16. Which of the following medium can total internal reflection occur as light is travelling? Water to air Air to water Glass to water no ideaQuestion 16 of 36 17. State the Law of refraction The incident ray, the refracted ray and the normal at the point of incidence all lie in the same plane The rate of the sine of the angle of incidence to the sine of the angle of refraction is a constant for a given pair of media.sin i/ sin r = kno ideaQuestion 17 of 36 18. Which of the following is NOT an application of total internal reflection? Magnifying glassPrism binoculars Optical fibers rain sensors in automatic windscreen wipersQuestion 18 of 36 19. What happens when light travels from a dense medium (glass) to a less dense medium (air)? Reflection occurs Light Is refracted towards the normal the angle of incidence of the light ray is less than the angle of refraction none of the mentioned Question 19 of 36 20. Will refraction occur when the angle of incidence of the light is zero and there is no change in direction? Yes Maybe No None Question 20 of 36 21. Briefly explain what shall happen when the angle of incidence exceeds the critical angle C? Refraction shall occur There will be no refraction The light is reflected internally no ideaQuestion 21 of 36 22. What is the name given for an angle of incidence in the dense medium for which the angle of refraction in the less dense medium is 90 degrees? Refractive index Total internal refraction Crucial angle Critical angle Question 22 of 36 23. Can total internal reflection occur when light travels from a less dense medium to a denser medium like air to water? Yes No Maybe None of the mentioned Question 23 of 36 24. What happens when light travels from a dense medium (glass) to a less dense medium (air)? Reflection occurs Light is refracted away from the normal Light is reflected towards the normal None Question 24 of 36 25. Define the principle of reversibility of light When light travels from a less dense medium (air) to a denser medium (glass) the light ray is bent towards the normal When light travels from a dense medium (glass) to a less dense medium (air) the light ray is bent towards the normal When light travels from a dense medium (glass) to a less dense medium (air) the light ray is bent away from the normal None of the mentioned Question 25 of 36 26. Refractive index of a material (in terms of real and apparent depth) is? Refractive index = real depth x apparent depth Refractive index = n x vertical displacement Refractive index = (real depth )/(apparent depth ) None of the mentioned Question 26 of 36 27. What happens when light travels from a less dense medium (air) to a denser medium (glass)? Refraction does not occur The angle of incidence of the light ray is greater than the angle of refraction Light is refracted away from the normal None of the mentioned Question 27 of 36 28. What happens when light travels from a less dense medium (air) to a dense medium (glass)? Reflection occurs Light is reflected away from the normal Light is refracted towards the normal None Question 28 of 36 29. Is it possible for a ray of light to have an angle of refraction greater than 90 degrees? Yes No Maybe None of the above Question 29 of 36 30. Mention the 2 key main factors for total internal reflection to occur? Light must be travelling from a less dense medium to a denser medium Light must be travelling from a denser medium to a less denser medium The angle of incidence must be greater than the critical angleAll of the above Question 30 of 36 31. Define the refractive index in terms of velocity for a light ray travelling from vacuum to medium? n = (velocity of light in vacuum )/(velocity of light in medium )n = 1/(velocity of light in medium )n = 1/(1n2 ) none of the mentioned Question 31 of 36 32. Which of the following statement is CORRECT about refraction? The angle of incidence of a ray of light has to be more than zero at the interface Light should travel from a less dense medium (air) to a denser medium (glass) or vice versa for refraction to occur. The light velocity should reduce greatly when refraction occurs from a less dense medium to a denser medium.None of the above Question 32 of 36 33. Mention the disadvantage to which a plane mirror has that make it not preferable for used in a periscope and other optical instrument? Plane mirrors absorb some of the incident light Thick plane mirrors produce multiple images The silvering on mirrors can become tarnished and peel off None of the above Question 33 of 36 34. Light is bent as it travels from one medium to another and this bending occurs only at the interface? True False Maybe None Question 34 of 36 35. What is the relationship between Critical angle and refractive index? Critical angle and refractive index are equal Refractive index is equal to the reciprocate of sine of critical angle n = 1/sin c reflectionQuestion 35 of 36 36. Give the refractive index (according to the principle of reversibility of light) for a light ray reversed from medium 2 to 1? sin i/ sin r = n (sin r/ sin i) = 2n12n1 = 1/(1n2)All of the above Question 36 of 36 Loading...
