To determine the focal length of a convex lens by obtaining a sharp image of a distant object we generally follow the following steps which are not in proper sequence.a. Hold the lens between the object and the screenb. Measure the distance between the lens and the screenc. Select a well lit distant objectd. Place a screen opposite to the object on the lab tablee. Adjust the position of the lens to form a sharp image The correct sequence of these steps is:(a) c, a, d, e, b (b) c, d, a, e, b (c) c, d, e, a, b (d) c, a, e, d, b

(a) c, a, d, e, b       

Explanation

Converging Lens or Convex Lens -  It is a lens that possesses at least one surface that curves outwards. In other words, it is thick across the middle and thin at the upper and lower edges., because of which the light that enters the lens, get focused, or converged. Due to this effect, it is also called a positive lens or a diverging lens.

The image formed by a convex lens is both real and virtual depending on the position of the object, which means both diminished and magnified images can be produced.

It is used to treat a condition called longsightedness (also called hypermetropia). Also, used in the camera, projector, microscope, telescope, and magnifying glass.