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GEOMETRICAL OPTICS (REFRACTION) physical sciences G11

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NTOMBI MARGARET
NTOMBI MARGARET

Based on refraction only in the physics geometric optics

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PHYSICAL SCIENCES GEOMETRICAL OPTICS (REFRACTION) Grade 11 Presented by NM MAPHOTO
OBJECTIVE Define refraction Definition of refractive Index Defining Snells Law Understand refractive index Recognizing situations where refraction will occur. Identify which direction light will bent when it passes from one medium to another. Calculating refracted ray, incident ray, angle of incident or angle of refraction
CONTENT Introduction Definition of refraction Demonstration of refraction Refraction index Table of refraction index Ray diagrams Snells law Ray reflecting on two medium Assessment References
INTRODUCTION Everyday life situation that involve refraction of light. What happens when light passes from one medium to another. How the direction of light as it passes from one medium to another is associated with a change in velocity and wavelength and frequency.
REFRACTION Refraction occurs at the boundary of two media when light travels from one medium into the other and its speed changes, but its frequency remains the same. If the light ray hits the boundary at an angle which is not perpendicular to or parallel to the surface, then it will change direction and appear to bend.
DEMONSTATION OF REFRACTION The picture shows two mediums which is water and air. When the person looks in the water, she see the image of chest not the actual chest. It appears to bend due to refraction.
REFRACTIVE INDEX The refractive index (symbol n) of a material is the ratio of the speed of light in a vacuum to its speed in the material and gives an indication of how difficult it is for light to get through the material. where n = c/v n = refractive index (no unit) c = speed of light in a vacuum (3,00 108 m揃s1) v = speed of light in a given medium (m揃s1)
TABLE OF REFRACTIVE INDEX 1. Each medium has its own Constant refractive index as shown in the picture. 2. Each refractive index is used to calculate the speed of light in that given medium.
REPRESENTING REFRACTION WITH RAY DIAGRAMS Normal The normal to a surface is the line which is perpendicular to the plane of the surface. Angle of incidence The angle of incidence is the angle defined between the normal to a surface and the incoming (incident) light ray. Angle of refraction The angle of refraction is the angle defined between the normal to a surface and the refracted light ray.
SNELLS LAW There is a relationship between the angles of incidence and refraction of the indexes of refraction of 2 medium (n). Snells law applies to refraction of light in any situation regardless of the media. n1= refractive index of medium 1 n2= refractive index of medium 2
Ray reflecting between two medium 1. A ray entering a material of larger index bends towards the normal. 2. A ray entering a material of smaller index bends away from the normal. 3. A ray oriented perpendicular to a surface does not bends, regardless of the materials.
Activity https://docs.google.com/forms/d/e/1FAIpQLScOZlKDM8lIx 1qm_J2p34l_NYUpDqSARSxi_R0Z1-vj0_1CUw/viewform?usp =sf_link
Summery of refraction Video summery of refraction https://www.youtube.com/watch?v=zarxpu43-ls
REFERENCES Nagar, V. (2023). Geometric Optics.PDF. Geometrical Optics.PDF (slideshare.net) (Accessed 17 August 2024). Oh, M. (2011). Refraction. Available from slideshare at Refraction | PPT (slideshare.net) (Accessed 16 August 2024). Siyavula (2013). Geometrical optics. Available from slideshare at Geometrical optics | PPT (slideshare.net) (Accessed 18 August 2024) Swetha, R. (2017). Refraction. Available from slideshare at Refraction | PPT (slideshare.net) (Accessed 17 August 2024). Tatualia, E. (2015). Refraction of light. Available from slideshare at Refraction of Light | PPT (slideshare.net) (Accessed 17 August 2024). https://www.youtube.com/watch?v=zarxpu43-ls
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GEOMETRICAL OPTICS (REFRACTION) physical sciences G11

  • 1. PHYSICAL SCIENCES GEOMETRICAL OPTICS (REFRACTION) Grade 11 Presented by NM MAPHOTO
  • 2. OBJECTIVE Define refraction Definition of refractive Index Defining Snells Law Understand refractive index Recognizing situations where refraction will occur. Identify which direction light will bent when it passes from one medium to another. Calculating refracted ray, incident ray, angle of incident or angle of refraction
  • 3. CONTENT Introduction Definition of refraction Demonstration of refraction Refraction index Table of refraction index Ray diagrams Snells law Ray reflecting on two medium Assessment References
  • 4. INTRODUCTION Everyday life situation that involve refraction of light. What happens when light passes from one medium to another. How the direction of light as it passes from one medium to another is associated with a change in velocity and wavelength and frequency.
  • 5. REFRACTION Refraction occurs at the boundary of two media when light travels from one medium into the other and its speed changes, but its frequency remains the same. If the light ray hits the boundary at an angle which is not perpendicular to or parallel to the surface, then it will change direction and appear to bend.
  • 6. DEMONSTATION OF REFRACTION The picture shows two mediums which is water and air. When the person looks in the water, she see the image of chest not the actual chest. It appears to bend due to refraction.
  • 7. REFRACTIVE INDEX The refractive index (symbol n) of a material is the ratio of the speed of light in a vacuum to its speed in the material and gives an indication of how difficult it is for light to get through the material. where n = c/v n = refractive index (no unit) c = speed of light in a vacuum (3,00 108 m揃s1) v = speed of light in a given medium (m揃s1)
  • 8. TABLE OF REFRACTIVE INDEX 1. Each medium has its own Constant refractive index as shown in the picture. 2. Each refractive index is used to calculate the speed of light in that given medium.
  • 9. REPRESENTING REFRACTION WITH RAY DIAGRAMS Normal The normal to a surface is the line which is perpendicular to the plane of the surface. Angle of incidence The angle of incidence is the angle defined between the normal to a surface and the incoming (incident) light ray. Angle of refraction The angle of refraction is the angle defined between the normal to a surface and the refracted light ray.
  • 10. SNELLS LAW There is a relationship between the angles of incidence and refraction of the indexes of refraction of 2 medium (n). Snells law applies to refraction of light in any situation regardless of the media. n1= refractive index of medium 1 n2= refractive index of medium 2
  • 11. Ray reflecting between two medium 1. A ray entering a material of larger index bends towards the normal. 2. A ray entering a material of smaller index bends away from the normal. 3. A ray oriented perpendicular to a surface does not bends, regardless of the materials.
  • 13. Summery of refraction Video summery of refraction https://www.youtube.com/watch?v=zarxpu43-ls
  • 14. REFERENCES Nagar, V. (2023). Geometric Optics.PDF. Geometrical Optics.PDF (slideshare.net) (Accessed 17 August 2024). Oh, M. (2011). Refraction. Available from slideshare at Refraction | PPT (slideshare.net) (Accessed 16 August 2024). Siyavula (2013). Geometrical optics. Available from slideshare at Geometrical optics | PPT (slideshare.net) (Accessed 18 August 2024) Swetha, R. (2017). Refraction. Available from slideshare at Refraction | PPT (slideshare.net) (Accessed 17 August 2024). Tatualia, E. (2015). Refraction of light. Available from slideshare at Refraction of Light | PPT (slideshare.net) (Accessed 17 August 2024). https://www.youtube.com/watch?v=zarxpu43-ls