At what distance from the collecting lens you need to place the object to get the image: a) reduced; b) equal to the subject; c) enlarged (straight and inverted)?
a) at a distance greater than double focal length; b) at a distance equal to the double focal length; c) enlarged forward – at a distance shorter than the focal length, enlarged inverted – at a distance less than the double focal length, but greater than the focal length.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.