Reflection and refraction, Exams of Physics

Download Reflection and refraction and more Exams Physics in PDF only on Docsity!

PHYSICS – Reflection and Refraction

LEARNING OBJECTIVES

Core

• Describe the formation of an optical image by a plane mirror, and give its characteristics
• Recall and use the law angle of incidence = angle of reflection Describe an experimental demonstration of the refraction of light
• Use the terminology for the angle of incidence i and angle of refraction r and describe the passage of light through parallel-sided transparent material
• Give the meaning of critical angle
• Describe internal and total internal reflection Describe the action of a thin converging lens on a beam of light
• Use the terms principal focus and focal length
• Draw ray diagrams for the formation of a real image by a single lens
• Describe the nature of an image using the terms enlarged/same size/diminished and upright/inverted Supplement Describe the formation of an optical image by a plane mirror, and give its characteristics
  • Recall and use the law angle of incidence = angle of reflection Recall and use the definition of refractive index n in terms of speed
  • Recall and use the equation sin I / sin r=n
  • Recall and use n = n = 1 / sin c
  • Describe and explain the action of optical fibres particularly in medicine and communications technology Draw and use ray diagrams for the formation of a virtual image by a single lens
  • Use and describe the use of a single lens as a magnifying glass • Show understanding of the terms real image and virtual image

Reflection in a Plane

Mirror

Plane mirror Normal

Reflection in a Plane

Mirror

Plane mirror Normal Incident ray

Reflection in a Plane

Mirror

Plane mirror Normal Incident ray Reflected ray Angle of inciden ce Angle of reflecti on

Reflection in a Plane

Mirror

Plane mirror Normal Incident ray Reflected ray Angle of inciden ce Angle of reflecti on REMINDER: always use a ruler to draw light rays (light travels in straight lines) and don’t forget to include arrows showing direction of light.

Reflection in a Plane

Mirror

Plane mirror Normal Incident ray Reflected ray Angle of inciden ce Angle of reflecti on Laws of reflection :

1. The angle of incidence is equal to the angle of reflection.

Reflection in a Plane

Mirror

Plane mirror Normal Incident ray Reflected ray Angle of inciden ce Angle of reflecti on Laws of reflection :

1. The angle of incidence is equal to the angle of reflection.
2. The incident ray, the reflected ray and the normal all lie in the same plane (i.e. the two rays and the normal can all be drawn on a single sheet of flat paper).

Where is the image in a Plane Mirror?

Where is the image in a Plane Mirror?

Where is the image in a Plane Mirror?

The image in the mirror looks the same as the object, but it is laterally inverted (back to front). The image formed is upright , but it is a virtual image (doesn’t really exist).

Where is the image in a Plane Mirror?

The image in the mirror looks the same as the object, but it is laterally inverted (back to front). The image formed is upright , but it is a virtual image (doesn’t really exist). Dotted lines show the construction of the virtual image)

Where is the image in a Plane Mirror?

Normal view from the front. Same view as seen in the rear view mirror of a car.

Where is the image in a Plane Mirror?

Normal view from the front. Same view as seen in the rear view mirror of a car. The word AMBULANCE is laterally inverted so that it reads correctly when seen in a driving mirror.