Draw ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed : (a) at 2F1, (b) between F1 and the optical centre O of the lens. Which of the above two cases shows the use of the convex lens as a magnifying glass ? Give reasons for your choice.
Draw ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed : (a) at 2F1, (b) between F1 and the optical centre O of the lens. Which of the above two cases shows the use of the convex lens as a magnifying glass ? Give reasons for your choice.
(a) When the Object is Placed at 2F1
The image is -
- Formed at 2F2
- Real
- Inverted
- Same size as the object
(b) When the Object is Placed between F1 and O:
The image is -
- Formed on the same side of the lens
- Virtual
- Erect
- Magnified
A magnifying glass is a convex lens which produces a magnified image of an object. For a magnified image to be
observed the distance between the object and the lens has to be shorter than the focal length of the lens. The image
formed is upright, magnified and virtual.
The second case satisfies the above condition and the convex lens is used as a magnifier in that condition.
(a) When the Object is Placed at 2F1
The image is -
- Formed at 2F2
- Real
- Inverted
- Same size as the object
(b) When the Object is Placed between F1 and O:
The image is -
- Formed on the same side of the lens
- Virtual
- Erect
- Magnified
A magnifying glass is a convex lens which produces a magnified image of an object. For a magnified image to be
observed the distance between the object and the lens has to be shorter than the focal length of the lens. The image
formed is upright, magnified and virtual.
The second case satisfies the above condition and the convex lens is used as a magnifier in that condition.
