a) Refraction is the change of direction of light as it passes from one medium to another.
b) A lens forms an image by refracting light.
c) In a convex or converging lens, parallel rays of light are brought to a focu at the principle focus. The distance from the lens to the principal focus is called the focal length.
refractive index=sin i(angle of incidence)/sin r(angle of refraction)
d) The nature of an image is defined by its size relative to the object, whether it is upright or inverted relative to the object and whether it is real or virtual.
e) The nature of the image produced by a coverging lens for an object placed at different distances from the lens. ]
f) The use of a coverging lens as a magnifying glass.
g) The nature of the image produced by a concave or diverging lens.
h) The construction of ray diagrams to show the formation of images by converging and diverging lenses.
i) The magnification produced by a lens is calculated using the equation:
magnification=image height/object height
Comments
No comments have yet been made