A ray of light is incident on mirror m\(_1\) and after reflection is incident on mirror m\(_2\) as shown in the diagram above. Calculate the angle of reflection of the ray at mirror m\(_2\).

A ray of light is incident on a body x as shown in the diagram above. What is the refractive index of the body?

The image of any real object formed by a diverging lens is always

2a. 

(i) Fix a metre rule on the bench with the graduated face up.

(ii) Place the illuminated object at the zero end of the rule and the screen at the other end as illustrated in the diagram above.

(iii) Measure and record D, the distance between the object and the screen. Evaluate D\(^2\)

(iv) Place and move the converging lens between the illuminated object and the screen until a diminished, sharp image of the object is formed on the screen. Read and record the position, x\(_1\), of the lens. From this position, move the lens towards the object until another sharp image of the object is formed on the screen. Read and record the position, x\(_2\), of the lens.

(v) Evaluate and record L = (x\(_1\) - x\(_2\)), L\(^2\) and (D\(^2\) - L\(^2\)).

(vi) Repeat the procedure for D = 90, 80, 70, and 60 cm. In each case, evaluate L, L\(^2\), and (D\(^2\) - L\(^2\)). Tabulate your readings.

(vii) Plot a graph of D\(^2\) - L\(^2\) on the vertical axis against D on the horizontal axis.

(viii) Determine the slope, s, of the graph and evaluate K = \(\frac{\text{s}}{4}\). State two precautions taken to ensure accurate results.[21 marks]

bi. Distinction Between Real and Virtual Images [2 marks]

ii. Draw a ray diagram to show how a converging lens may be used to form a real diminished image of an object [2 marks]