8.Draw ray diagrams to show how (I.) A plane mirror (ii) a convex mirror (iii) a concave mirror, can form an image. Describe a practical application of each type of mirror.



9.(i) Describe the construction and mode of image formation by a pinhole camera. What is the effect on the image produced by the camera when

a. the diameter of the pinhole is increased

b. the object distance is doubled

c. the length of the camera is increased.

(ii) The screen of a pin-hole camera is a square, of side 0.16 m and it is 0.15 m behind the pinhole. The camera is placed 11 m from a flag staff and positioned so that the image of the flag staff is formed centrally on the screen. The image occupies three-quarters of the height of screen. What is the height of the flag staff? What are the major disadvantages of a pinhole camera compared to a lens camera.

10. Explain the terms radius of curvature and principal focus as applied to a concave mirror, illustrating your answer by diagrams. What are the disadvantages and advantages of spherical

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