Q1. (a) The diagram shows a ray of light being reflected by a plane mirror. the angle of reflection? (2)

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Colin French
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1 Q. (a) The diagram shows a ray of light being reflected by a plane mirror. Which of the angles, a, b, c or d, is: the angle of incidence; the angle of reflection? The diagram shows a road junction seen from above. A mirror placed at the side of the road allows the driver of car X to see car Y. Using the same mirror symbol given in part (a), draw a plane mirror to show how it should be placed so that the driver of car X can see car Y. (Total 4 marks) Q2. (a) The diagram shows two mirrors at right angles to each other. A ray of light shines onto one mirror as shown. Carefully draw the path of the ray which is reflected from both mirrors. Draw an arrow on the ray to show the direction of the light. Page

2 (3) Light can also be made to change direction as it passes into and out from a block of glass. Complete the ray diagram below. Q3. The diagram shows a plane mirror used by a dentist to see the back of a patient s tooth. (Total 5 marks) (a) Use a ruler to draw a ray of light on the diagram to show how the dentist is able to see the tooth labelled Z. Describe the image formed by a plane mirror.... (3)... (Total 5 marks) Q4. A student uses a ray box and a semicircular glass block to investigate refraction. Page 2

$(a) What is the vertical dashed line called? Which angle, v, w, x, y or z, is the angle of refraction? (c) Why has refraction taken place?$

3 (a) What is the vertical dashed line called? Which angle, v, w, x, y or z, is the angle of refraction? (c) Why has refraction taken place? (d) In an investigation, a student always aims the light from the ray box at point P. She moves the ray box to give different values of angle v. She records angle y for each of these values. The table shows her results. Angle v measured in degrees Angle y measured in degrees The student studies the data and comes to the following conclusion. Page 3

4 Angle y is directly proportional to angle v. Her friend says that this conclusion is not correct. (i) Use data from the table to explain why the conclusion is not correct. (ii) Write a correct conclusion for the experiment. (iii) Why is your conclusion only valid when angle v is between 30 and 80? (Total 7 marks) Page 4

5 M. (a) b c correct order only mirror opposite road junction mirror facing correct way, angle correct judged by eye [4] M2. (a) first reflection vertically down to the fourth hatch line or just to the left of it reaching mirror (must come from incident ray given) second reflection back parallel to incident ray must be linked to first part of ray appropriate arrow on a part of the ray (may be given if lines wrong) (must come from source of light) maximum of one mark to be lost for poor diagrams not using a ruler for straight lines first time you come across wavy line, it is penalised ray in block bent downwards, not beyond the normal do not credit if exactly on normal emergent ray parallel to incident ray do not credit a continuation of the line straight through the block these are independent Page 5

6 [5] M3. (a) ray drawn from tooth to mirror to eye angle I = angle R judged by eye at least one arrow in correct direction do not credit conflicting arrows if no ruler used maximum mark is 2 virtual upright [5] M4. (a) the normal v (c) any one from: light has moved from glass to air / from air to glass accept light has changed medium speed of light has changed beware of contradictions for this marking point eg light has moved from glass to air and slowed down gets zero angle of incidence is less than the critical angle or (angle) i < (angle) c or (angle) y is less than the critical angle change in density (of medium) eg glass is more (optically) dense than air (d) (i) ratio of v to y does not give the same answer (in every case) Page 6

Name: Chapter 14 Light. Class: Date: 143 minutes. Time: 143 marks. Marks: Comments: Page 1 of 53

Name: Chapter 14 Light. Class: Date: 143 minutes. Time: 143 marks. Marks: Comments: Page 1 of 53 Chapter 4 Light Name: Class: Date: Time: 43 minutes Marks: 43 marks Comments: Page of 53 A person can see an image of himself in a tall plane mirror. The diagram shows how the person can see his hat. (a)