Light and Optical Systems: Going Further

Reflection, refraction and lenses, predicted rather than recited.

8 questions, free, marked as you go with a worked explanation on every one.

What this covers

The questions

  1. A ray of light strikes a plane mirror at an angle of incidence of 35 degrees, measured from the normal. What is the angle between the incoming ray and the reflected ray?
  2. A straw in a glass of water looks bent at the surface. What causes this?
  3. An object is placed further from a convex lens than twice its focal length. What is the image like?
  4. Which of these use a concave (diverging) mirror or lens rather than a convex one? Select all that apply.
  5. A red apple is lit by pure green light in an otherwise dark room. What colour does it appear, and why?
  6. Light travels at about 300000 km per second. The Moon is about 384000 km from Earth. How many seconds does light take to reach the Moon, to two decimal places?
  7. Where does a normal human eye form its image, and what corrects short-sightedness?
  8. Which of these places the parts of the electromagnetic spectrum in order of increasing wavelength?

Answer these free