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Draw a labelled ray diagram to show how a ray of light passes through a parallel sided glass block:(a) if it hits the glass block at 90° (that is, perpendicular to the glass block)(b) if it hits the glass block at an angle other than 90° (that is, obliquely to the glass block).
(a) If the light ray hits the glass block at 90° (that is, perpendicular to the glass block):
(b) If it hits the glass block at an angle other than 90° (that is, obliquely to the glass block):
Explanation
The angle of refraction or the amount of bending of light depends on the refractive index
1. When light passes through a low refractive index, like air (faster medium or optically rarer medium) to a high refractive index, like glass(slower medium or optically denser medium), its speed decreases and bends towards the normal.
2. When light passes through a high refractive index, like glass (slower medium or optically denser medium) to a low refractive index, like air (faster medium or optically rarer medium) its speed increases and bends away from the normal.
3. However, if the light ray hits the glass block at right angles (at 90°) to the surface, then the light ray will not bend.
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