Visible light is one component of the electromagnetic spectrum.

1. (a)State the speed of light in a vacuum.[1]
2. (b)State the colours of the visible spectrum.[1]
3. (c)(i)An object O of height 3.0cm is placed 4.0cm from the centre of a diverging lens. Fig. 10.1 shows the object O, the diverging lens and the two focal points (principal focuses), F₁ and F₂, of the lens. Determine the focal length of this lens.[1]
4. (c)(ii)The diverging lens produces an image of object O. On Fig. 10.1, by drawing rays from the tip of O, locate this image and label it I.[4]
5. (c)(iii)Determine the height of the image.[1]
6. (c)(iv)Determine the magnification of the image.[1]
7. (c)(v)State two ways in which a virtual image differs from a real image.[2]
8. (c)(vi)State one use for a diverging lens.[1]
9. (d)Light passing from air into glass refracts in a similar way to a water wave passing from deep water into shallow water. Fig. 10.2 represents light passing from air into glass at an angle to the surface. [Figure 10.2] One side of a wavefront strikes the glass before the other side. Explain why the wavefronts change direction as the light enters the glass.[3]

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