Waves

• White surfaces reflect more infrared radiation than any other colour surface.
• What happens when a converging lens is more than two focal points away?


  The image will be inverted and diminished, so the magnification will be between 0 and -1.
• How does a more curved convex lens affect the focal length?

  The angle of incidence will be larger, causing more refraction, and giving a shorter focal length.
• No image is formed when the object is placed at the principal focus, because all the refracted rays will be parallel.
• True or False? All objects can absorb infared radiation?

  True