Page 247 - text book form physics kssm 2020

Chapter 6
Light and Optics
Formative Practice 6.1
6.1

1. Figure 6.16 shows the path of light which travels from medium 1 to medium 2.

75° Medium 1

Medium 2
55°

Figure 6.16
(a) Write an equation to relate the light that travels through the mediums.
(b) Determine the refractive index for medium 2 if the speed of light in medium 1
8
–1
is 3.0 × 10 m s .
(c) What is the speed of light in medium 2?

2. Figure 6.17 shows a tank fi lled with oil to a height of 3 m. Th e oil has a refractive
index of 1.38. What is the apparent depth of the tank as seen by the observer from
above the tank?

Observer

Tank

3 m
Oil

Figure 6.17

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