The ancestral house of Subhash Chandra Bose is now turned into

For drawing the ray diagram three rays, focal length must included.

Explanation:

for drawing the ray diagram three rays, focal length must included.

for drawing ray diagram three rules of refraction must be followed. Steps needed to draw the ray diagram are.

1) three rays are incident from top edge of objects towards the lens

2)  these incident rays are reflected according to principle of three rules of refraction for any given converging lens

3) mark the image point after refracted rays intersect

4) repeat the same process for base of given object to get the desire image