lenses

• convex lense diagram

  
• how do we know that this diagram is a convex lense?


  the lights all refract to a point

  
• how are the lenses drawn (diverging is the same as concave lense)

  A) concave

  
• we know this is a concave lense since the lines of light refracted don't meet at a focal point therefore the focal point is to the left of the lens.

  
• diagram of a concave lens. as seen the focal point is to the left of the lense. this means that this is a virtual image.

  
• what is the difference between real and virtual images


  • Real image → Right side (opposite side of lens, inverted).

  • Virtual image → Left side (same side as the object, upright).
• What happens to light rays that pass through a lens?


  it is refracted
• What name is given to the distance between the lens and the principal focus/ focus point?


  the focal length
• what is the difference the terms principal focus and focal point? 


  the terms principal focus and focal point both refer to the same concept and can be used interchangeably when describing where parallel rays of light converge or appear to converge after interacting with a lens or mirror.
• the 3 correct statements are that the image is upright, enlarged and virtual

  
• in this case the image is virtual as it is on the left of the lense