Name the type of mirrors used in the design of solar furnaces. Explain how high temperature is achieved by this device.

Which type of mirror is used in a solar furnace? Support your answer with reason.

Draw and complete the following diagrams to show what happens to the beams of light as they enter the glass block and then leave it:

Draw ray diagrams showing the image formation by a concave lens when an object is placed:
At the focus of the lens.

Draw diagram to represent the action of a concave mirror on a beam of parallel light rays. Mark on this diagram principal axis, focus F, centre of curvature C, pole P and focal length ƒ, of the concave mirror.

When an object is placed at a distance of 15cm from a concave mirror, its image is formed at 10cm in front of the mirror. Calculate the focal length of the mirror.

Draw a ray diagram to show the formation of a virtual magnified image of an object by a convex lens. In your diagram, the position of object and image with respect to the principal focus should be shown clearly.

A convex lens of power 5D and a concave lens of power 7.5D are placed in contact with each other. What is the:

1. Power of this combination of lenses?
2. Focal length of this combination of lenses?

Draw ray diagrams showing the image formation by a convex lens when an object is placed:
At the focus of the lens.

Draw a diagram to represent a convex mirror. On this diagram mark principal axis, principal focus F and the centre of curvature C if the focal length of convex mirror is 3cm.