1. An object is placed in front of a convex lens of focal length f. If the distance of the object from the lens is 2f, draw a ray diagram to show the formation of the image. State two characteristic of image formed.

2. A student has focussed the image of a candle flame on a white screen using a convex lens. The situation is as given below: Length of the flame = 1.5 cm Focal length of the lens = 12 cm Distance of the flame from the lens = 18 cm If the flame is perpendicular to the principal axis of the lens, calculate the values of the following:

a. Distance of the image from the lens

b. Length and nature of the image formed​