Light and Optics

Question 1:Three torchlights are switched on as in the diagram below. What are the colours formed in A, B, C and D? Answer:A = Magenta, B = Cyan, C = Yellow, D = White Question 2:State the colours of the light formed on the screen in the diagrams below. Answer:(a) red(b) green(c) magenta

Question 1:Why does scattering of light occur? Answer:Scattering of light occurs because light rays are blocked and reflected to all directions by the clouds or particles in the air. Question 2:Fill the blanks with the correct words. Answer:more, less

Activity 8.8:Aim: To study the scattering of lightMaterials and apparatus: Milk powder, 1000 ml glass beaker, ray box, white screen.Instruction1. Carry out this activity in the dark.2. Set up the apparatus as shown in Figure 8.23.3. Turn on the ray box.4. Add a few tablespoons of milk powder into the water. Stir the water until … Read more

Question 1:List the seven colours formed on the screen below in the correct order. Answer:Red, orange, yellow, green, blue, indigo, violet Question 2:State the colour component that is refracted the most and refracted the least in the phenomenon above.Relate the phenomenon with the speed of each colour component. Answer:Red light is refracted the least because … Read more

Question 1:Why does the bottom of a deep swimming pool appear shallower? Answer:When light rays from the bottom of the swimming pool leave the water, they are refracted. This makes the image of the bottom of the swimming pool to look shallower compared to its real depth. Question 2:Light rays refract at a certain angle … Read more

Experiment 8.2:Problem statementWhat is the relationship between the angle of incidence, i and angle of refraction, r when light travels from a less dense medium to a more dense medium?Hypothesis: The greater the angle of incidence, i, the bigger the angle of refraction, r.Aim: To determine the relationship between angle of incidence, i and angle … Read more

Question 1:Explain the Law of Reflection with the help of a light reflection ray diagram. Answer:According to the law of reflection, angle of incidence, i, is equal to angle of reflection, r. Question 2:Complete the statement below.The image formed by a plane mirror is _________, _________, _________ and the image distance is __________ with the … Read more

Experiment 8.1:Problem statement: What is the relationship between the angle of incidence, i and angle of reflection, r?Hypothesis: The angle of incidence, i is the same as the angle of reflection, r.Aim: To determine the relationship between the angle of incidence, i and angle of reflection, rVariablesManipulated variable: Angle of incidence, iResponding variable: Angle of … Read more

Question 1:Hisyam’s shadow is the shortest in the _______________ when the Sun is _______________ his head. Answer:afternoon, above Question:The diagram shows two opaque objects blocking the light from a torchlight.Draw the shape of the shadow that will be formed on the screen. Answer:

Question 1:The picture shows a man standing in front of a mirror. What type of mirror is it? State the characteristic of the image formed. Answer:Convex mirror, the man looks slim Question 2:What is the function of plane mirrors in a periscope? Answer:To reflect light so that the image can be formed in the eyes. … Read more