Page 2 - HA-sign convention rules of sph lens

5. If an object is placed at 100 cm away from a convex lens of focal length 50 cm,
the image is formed at

a) 100 cm from the lens on the same side of the object.
b) 100 cm from the lens on the other side of the object.

c) 50 cm from the lens on the same side of the object.
d) 50 cm from the lens on the other side of the object.

Conceptual Questions

1. At what distance the object should be placed so that the image will be

formed at a distance 10 cm from a concave lens? Focal length of the lens
is 20 cm.

2. A concave lens has a focal length of 15 cm. At what distance should an
object from the lens be placed so that it forms an image at 10 cm from the

lens? Also find the magnification of the lens.

3. An object is placed at 13 cm away from a convex lens of focal length 25 cm,

what are the characteristics of the image formed?

4. Image size of a pencil is 12 cm and the magnification of lens is + 2. Find the
nature of the image and the original size of the pencil?

5. An object 5 cm in length is held 25 cm away from a converging lens of focal
length 10 cm. Draw the ray diagram and find the position, size and nature

of the image formed.

Objective Questions:

Subjective Questions:

1. What is meant by a spherical mirror?
2. What are types of spherical mirror?
3. What are 3 types of mirrors?
4. How spherical mirrors are formed?
5. Who discovered spherical mirrors?