An object and a screen are separated by 15.0 cm. A convex lens is placed between them, 6.82 cm from the object. In this position it causes a sharp imageof the object to form on the screen. What is the focal length of the lens?

A compound microscope has a barrel whose length is 16.0 cmand an eyepiece whose focal length is 1.4 cm. The viewer has a near pointlocated 25 cm from his eyes. What focal length must the objective have sothat the angular magnifi cation of the microscope will be -320?

please answer asap thx

PLEASE PLEASE HELP ME ANSWER THIS CORRECTLYYY! The image behind a convex mirror (radius of curvature = 79.0 cm) is located 27.0 cm from the mirror.  (a) where is the object located? (give the distance to the mirror) (b) what is the magnification of the mirror?

A lens forms an image of an object5.00 cm from the lens on thesame side as the object. Theobject is located 20.0 cm from thelens. (a) What is the focal length of thelens? Is the lens converging ordiverging? (b) If the object is 2.00 cm tall, howtall is the image? Is it upright orinverted?

A camera is equipped with a lens with a focal length of 30 cm When an object 200 cm away is being photographed, how far from the ?9?lm should the lens be placed?

2,2

if the focal length is negative, is the focal point benind or in front a -4.5D lens?