Question

An object is placed 12 cm away from the optical center of a lens. Its image is formed
exactly midway between the optical center and the object.
(i) What is the nature of the lens?
(ii) is the image formed erect or inverted?
(iii) Draw a ray diagram to show the image formed.
(iv) Calculate the focal length of the lens used

Answer 1

1 - CONCAVE LENS

2 - INVERTED

Answer 2

Answer:

Hi . Here's your answer

Explanation:

i.Concave Lens

ii.Erect because concave lens always forms erect image

iii.We follow the usual method of drawing the ray-diagram:

Consider two rays starting from the object. One passes through the optical center of the lens and the other would get refracted by the lens. e observe that on the other side of the lens, both these rays diverge and the image location can be found by extending the refracted rays backwards on the object's side the lens.

When object AB is placed between the optical center and Focus F1 of the Convex lens,the

image AB is always located somewhere on the same side of the lens as the object and somewhere further from the lens. The image is located behind the object is upright and enlarged.