A detective holds a magnifying glass 5.0 cm above an object he is studying, creating an upright image twice as large as the object. What is the focal length of the lens used for the magnifying glass?

Two lenses are separated by 50 cm. Lens 1 is convex and has a radius of curvature of magnitude 30 cm. Lens 2 is concave and has a radius of curvature of magnitude 40 cm and is located to the right of Lens 1. An object is located 20 cm to left of lens 1.   Find the location of the final image of the object. What is the magnification of the final image?

An object is placed in 5 cm in front of a lens, producing an image that is upright and 3 times larger, m = +3. Determine the position of the image and the focal length of the lens.

An object is placed at a distance of 10.0 cm from a convex lens with a focal length of 15.0 cm, and a virtual image is formed .  Calculate the magnification factor for the image.

Mike holds a magnifying glass (convex lens) 5.00 cm above a sheet of paper. He looks at the writing on the page and notices that it is magnified by a factor of 3.00. What is the focal length of the lens he is using? a 2.00 cm b 4.00 cm c 7.50 cm d 3.75 cm

A small object 1.0 cm high is placed on the principal axis 8.0 cm from a convex spherical mirror with a focal length of 12 cm.  What is the position    and size of the image formed?

A converging lens of focal length f=2 cm is used to focus the image of an object onto a screen. The object and screen are separated by 15 cm. The lens is placed between the object and the screen, at a distance from the screen such that the image of the object is focused into the screen. At what distance from the screen must the lens be placed in order to have an image magnification < 1? Provide your answer to two significant figures. distance = cm.

A concave mirror with focal length 16.0 cm is placed 45.0 cm to the left of the object. A convex lens of focal length 15.0 cm is placed 6.0 cm to the right of the object. Where is the image formed by both the mirror and the lens?

A man standing 1.54 m in front of a shaving mirror produces an inverted image 18.6 cm in front of it. How close to the mirror should he stand if he wants to form an upright image of his chin that is twice the chin's actual size? cm A contact lens is made of plastic with an index of refraction of 1.40. The lens has an outer radius of curvature of +1.92 cm and an inner radius of curvature of +2.47 cm. What is the focal length of the lens? cm

A concave mirror (R = 82.3 cm) is used to project a transparent slide onto a wall. The slide is located at a distance of 53.3 cm from the mirror, and a small flashlight shines light through the slide and onto the mirror. (a) How far from the wall should the mirror be located? (b) The height of the object on the slide is 1.13 cm. What is the height of the image?