Thin Lens Equation

A concave mirror has a focal length of 40 cm. Determine the object position for which the resulting image is upright and 4 times the size of the object.

You want to form an image on a screen 10 m from a mirror. If the image is 7 times bigger than the object, what type of mirror do you need? What is the radius of curvature?

Given an object height of 3 cm and a convex lens of focal length 10cm. Determine the position and size of the produced image if the object is placed at:

A. 30 cm

B. 5 cm

A light bulb is placed to the left of a convex lens of focal length 20 cm. The image formed is enlarged 5 times and is to the right of the lens. Find the image distance and the object distance.