Define the focal length of a lens.The distance to the furthest object that can be seen through itThe minimum thicknessThe distance from the focal point to the centre of the lensIts distance from an observer's eye

An object is placed 65.7 cm from a converging lens that has a focal length of 24.6 cm. Determine the image distance. Enter a – answer if appropriate.Image DistancecmInfoAttempts: 0/∞SubmitDetermine the magnification of this image. Enter a – answer if appropriate.

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.

An object placed in front of a lens, forms a virtual image whose magnifications is 0.5. The focal length of the lens is 30cm. Calculate the object distance.(with sign)

A lens with a focal length of 35cm is used to form an image of an object. When this lens is placed a certain distance X from the object, no image is formed. Give this distance X in cm.

An object is placed at a distance of 20 cm from a convex lens of focal length 10 cm. The image is formed on the other side of the lens at a distance20 cm10 cm40 cm30 cm