Finding Focal Length Of A Convex Lens

The image obtained while finding the focal length of a convex lens is ……………… .

How would you find the focal length of a convex lens rapidly but approximately?

Choose the correct alternative and write it along with its alloted alphabet: The image obtained while finding the focal length of a convex lens is …………..

Find the focal length of a convex lens which produces a virtual image at 10 cm from the lens when an object is placed at 5 cm from the lens.

Find the focal length of a convex lens which produces a real image at 60 cm from the lens when an object is placed at 40 cm in front of the lens.

Find the focal length of a convex lens which produces a real image at 60 cm from the lens when an object is placed at 40 cm in front of the lens .

Find the focal length of a convex lens which produces a virtual image at 10 cm from the lens when an object is placed at 5 cm from the lens .