grade 9 final revision unit 1 & 2

Draw the opposite figure in your answer paper, then :

(a) Complete the figure to obtain an

image for the object.

(b) Mention the properties of the formed image.

An object with 6 cm height is placed at a distance 10 cm, from a convex lens.

its focal length is 5 cm, therefore the height of the formed image is.........

Draw the figure in your answer paper, then complete to obtain real, inverted and diminished image for the object (A).

Draw the opposite diagram in your answer paper, then:

- Complete the path of the rays to form an image for the object.

- Determine the position of the formed image from the figure.

If an object is put in front of a convex lens at a distance of 30 cm and its image is

formed behind the lens at a distance of 30 cm, the focal length of the lens is............

The incident light ray that passes through the optical center of the convex lens, it exits from the lens ------------

If the diameter of the sphere of a lens equals 15 thus the focal length equal ---------

The radius of the convex lens ------------ its focal length

The line joins the center of curvature of the lens and its optical centre

The straight line joining between the two centers of curvature of the lens and passing through the optical center.