Question

(a) Draw a ray diagram to show the formation of image by a convex lens when an object is

placed in front of the lens between its optical centre and principal focus.

(b) In the above ray diagram mark the object-distance (u) and the image-distance (v) with their

proper signs (+ve or –ve as per the new Cartesian sign convention) and state how these

distances are related to the focal length (f) of the convex lens in this case.

(c) Find power of a convex lens which forms a real, and inverted image of magnification –1 of

an object placed at a distance of 20 cm from its optical centre.

Answer 1

B)=In the above Ray diagram mark the object distance (u)and the image distance (v) with their