Ray model of light

• • The image is of the same size as the object.
  • The image is upright.
  • The image is virtual. A virtual image is formed on mirror and cannot be formed on a screen.
  • The image is laterally inverted.
• Characteristics of images formed by plane mirrors.

  The distance between the image and the mirror is equal to the distance between the object and the mirror.
• • Angle of Incidence: Angle between the Incident ray and the normal.
  • Angle of Reflection: Angle between the reflected ray and the normal.

  
• Relationship between the Angle of Incidence and the Angle of Reflection.

  The Angle of Reflection is equal to the angle of Incidence.
• Curved Mirrors.

  • Convex Mirror (Curves Outwards).
  • Concave Mirror (Curves Inwards).
  • Both have reflecting surfaces that are curved differently.
• Reflection on a Smooth surface.

  Clear images are formed when reflection on a Smooth surfaces occurs.
• Reflection on a Rough surface.


  When parallel rays of light fall on a Rough surface, each ray is reflected in a different direction.

  
• Infrared Radiation.

  • Infrared technology can be used in Healthcare.


  Harmful Effects.

  • Overexposure to Infrared Radiation can harm us. Workers who have prolonged exposure to Infrared Radiation must wear goggles to protect their eyes.
• Ultraviolet (UV) Radiation.

  • Exposure to a small amount of UV radiation is good for our Health, as it increases the production of vitamin D in our bodies and also used in Medical Treatment


  Harmful Effects.

  Overexposure to UV radiation can harm our eyes and cause skin cancer. Encouraged to put on Sunscreen when going outdoors.