Translate the following statements into chemical equations and then balance them: 2 (i) Solution of barium chloride and aluminium sulphate in water react to give insoluble barium sulphate and the solution of aluminium chloride. (ii) Aluminium metal reacts with steam to give aluminium oxide and hydrogen gas. | Case | Mirror | Focal Length <br> (cm) | Object <br> Distance (cm) | | :---: | :---: | :---: | :---: | | 1 | A | 20 | 45 | | 2 | B | 15 | 30 | | 3 | C | 30 | 20 | (i) In which one of the above cases the mirror will form a diminished image of the object? Justify your answer. 1 (ii) List two properties of the image formed in case 2. 1 (iii) (A) What is the nature and size of the image formed by mirror C? Draw ray diagram to justify your answer. 2 2 31/1/2

Explanation

To determine which case will form a diminished image, we need to calculate the magnification of the image in each case. The magnification of the image is given by the formula m = -di/do, where di is the image distance and do is the object distance. In case 1, m = -(-20)/45 = 0.44, which is greater than 1, so the image will be enlarged. In case 2, m = -(-15)/30 = -0.5, which is less than 1, so the image will be diminished. In case 3, m = -(-30)/20 = 1.5, which is greater than 1, so the image will be enlarged.

Explanation

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