# When looking obliquely at a window, you may see two reflected images close to each other. What causes this?

Lab 10. Reflection and Refraction

PRELIMINARY QUESTIONS

Figure 1

1. When looking obliquely at a window, you may see two reflected images close to each other. What causes this?
2. Binoculars and periscopes use prisms instead of mirrors to reflect light. How does this happen? Draw a sketch.
3. When hot air rises above a stove top, objects behind it appear to shimmer. What causes this?
4. In Fig.1, which refractive index is greater, na or nb? How would the figure appear if it was the other way round? Draw a sketch.

PART 1 ANALYSIS

NOTE: SHOW ALL YOUR WORK WHERE CALCULATING IS INVOLVED

1. What is the relationship between the angles of incidence and reflection?
2. What is the relationship between the object and image distances for a plane mirror?
3. Plot a graph of sin θa (y axis) vs. sin θb (x axis) and, from the slope, calculate the refractive index of the rectangular block. (The refractive index of air is 00029 which you can approximate to 1.0).

[Place graph here – 1 TOTAL]

1. Calculate the refractive index of the semicircular block.
2. What happened to the refracted ray when the angle of incidence was larger than the critical angle?
3. What happened to the intensity of the reflected ray when the angle of incidence was larger than the critical angle?

DATA TABLES

 Angle of incidence Angle of reflection 30° 45°

 Object distance (cm) Image distance (cm) 10

 Angle of incidence, θa Angle of refraction, θb sin θa sin θb

Refractive index of rectangular block:

Critical angle for semicircular block:

Refractive index of semicircular block:

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