Plane Mirror – Reflection

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Plane Mirror – Reflection. principle axis. C. F. V. Concave Mirror – Reflection. V. F. C. principle axis. Convex Mirror – Reflection. Incident Ray. angle of incidence. normal. angle of reflection. Reflected Ray. Reflection. Light is reflected from some objects. - PowerPoint PPT Presentation

Text of Plane Mirror – Reflection

Concave Mirrors

Plane Mirror ReflectionConcave Mirror Reflectionprinciple axisCVFConvex Mirror Reflectionprinciple axisCVFReflectionnormalangle ofreflectionangle ofincidenceIncident RayReflected Ray

Light is reflected from some objects.

You can clearly see through some objects.

When a material transmits all or almost all incident lightObjects can be clearly seen through the material

Transparent ObjectsTransparent object/mediumMedium 2Medium 1Medium 1The speed of light varies, depending on the medium of transmission.Medium 2Medium 1Medium 1Speed of light changesDifference in speed causes light to bend!

Incident RayMedium WaterMedium AirRefracted Ray

RefractionThe bending or change in direction of light when it travels from one medium into another.{How to Measure RefractionIncident RayMedium WaterMedium AirRefracted Raynormalangle ofrefractionangle ofincidenceExperimentIncident RayMedium Acrylic or GlassMedium AirnormalRefracted RayBA

ExperimentIncident RayMedium Acrylic or GlassMedium AirnormalRefracted RayBAWhy does light bend when it hits a medium?

ObservationsIncident RayMedium AcrylicMedium AirnormalIncident angle at 0:Refracted Rayangle ofrefraction (B)angle ofincidence (A)Light travelled straight throughFrom air to glass or acrylic:Angle of refraction less than incident angle

A > BLight travelling from air into glass or acrylic:ObservationsIncident RayMedium AcrylicMedium AirnormalRefracted Rayangle ofrefraction (D)angle ofincidence (C)Angle of refraction more than incident angle.

C < DLight travelling from glass or acrylic to air:A = D

B = CIncident Ray, Refracted Ray, and normal all on the same plane (just like reflection).

Incident Ray and Refracted Ray are on the opposite sides of the line indicating the separation of two mediums.Conclusions RefractionIncident RaynormalRefracted RayLight bends towards the normal when light in the second medium is slower than the first medium.

Light bends away from the normal when light in the second medium is faster than the first medium.Conclusions RefractionIncident RaynormalRefracted Rayi Ri RsinisinRsinisinR030405060Observations and Resultsi Ri RsinisinRsinisinR3019.01.550.490.331.514025.01.600.640.421.525030.01.670.770.501.536034.51.740.870.571.53Observations and ResultsIndex of Refraction

Index of RefractionMediumnVacuum/space and Air1.00Ice1.31Water (pure)1.33Ethyl alcohol1.36Quartz1.46Vegetable oil1.47Olive oil1.48Acrylic1.49Glass1.52Diamond2.42What of the Speed of Light?mediumSpace/vacuumnormalRicvSpeed of light (vacuum)Speed of light (medium)Comparing the Speed of Light

Index of Refraction

Index of Refraction

mediumSpace/vacuumnormalRicvSpeed of light (vacuum)Speed of light (medium)Index of RefractionsMediumnVacuum/space and Air1.00Ice1.31Water (pure)1.33Ethyl alcohol1.36Quartz1.46Vegetable oil1.47Olive oil1.48Acrylic1.49Glass1.52Zircon1.92Diamond2.42Example 1Example 1Calculate the speed of light in zircon. Example 2Calculate the speed of light in zircon.

Example 2The speed of light in salt (sodium chloride) is 1.96108 m/s. Calculate the index of refraction for sodium chloride.Calculate the speed of light as it is transmitted through olive oil.Light from air is observed to enter a medium with an incident angle of 51 and a refracted angle of 32. What is the medium? How fast does light travel through the medium?Questionsn = 3.00/1.96v = (3.00/1.48)*10^8medium is quartz (n = 1.46); v = (3.00/1.46)*10^838