Look at the diagram below. The light source is 0.27 m from the lens. The screen is moved to a distance of 0.11 m from the centre of the lens so an image of the light source is seen at the screen.Calculate the focal length of the lens. Express answer to three decimal places,use SI units.

If light from a source that is at an infinite distance from the lens forms an image at a distance of 0.26 m from the centre of the lens, what is the focal length of this lens? Give your answer to 2 decimal places

An object 50 cm tall is placed on the principal axis of a convex lens. Its 20 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. Calculate the focal length of the lens upto two places of decimal.

A projector lens is needed to form an image on a screen 10 times the size of its corresponding object. The screen is located 8.0 m from the lens. What is the required focal length of the lens?

An object is placed 12 cm in front of a lens with a focal length of 8.0 cm.(i) (2 marks)Calculate the image distance.(ii) (2 marks)Sketch a ray diagram of the image, and lens, showing at least the three principal rays. You may include more relevant rays if you wish.

The graph shows how the magnification m produced by a thin lens varies with image distance v. What is the focal length of the lens used?