Experiment 7 Fisika

EXPERIMENT 7 Aim 1. To verify Snell’s Law 2. To determine the refractive index of glass

Basic Theory A certain light wave transports energy from one location to another and when it hits a boundary plane between two different medium, then some of the energy will be reflected by the boundary plane and stay in the initial medium.

Apparatus •

Rectangular glass block

•

Ray box

•

White paper

Procedure 1.

Place a rectangular glass block on the large of white paper and carefully

trace its outline. 2.

Remove the glass block. Draw a normal line through a convenient point X.

3.

Replace the glass block. Adjust the ray box so that the incident ray is

directed to point X with i = 40º. Mark the emergent ray with two pencils crosses P1 and P2. 4.

Remove the glass block. draw a straight line through the points P1 and P2

unit it meets the outline of the block at Y. Join Y to X with straight line to represent the refracted ray for i = 40º, measure the angle of refraction r. 5.

Repeat step 3 and 4 for i equal to 50º,60º,70º,and 80º.

6.

Record your result in the table below.

Result & Analysis Data i 40 º 50 º 60 º 70 º 80 º

r 25º 30º 34º 40º 45º

Sin i 0,64 0,767 0,867 0,94 0,98

Sin r 0,42 0,5 0,56 0,64 0,7

n=sin i/sin r 1,52 1,534 1,55 1,47 1,4 AVERAGE 1.49

Conclusion a) The ratio of

sin i is found to be sin r

0.8388 = 1.487234 = 1,49 0.564

b) The refractive index of glass is 250, 300, 340, 400, and 450.

Asessor:

The experimenters : IL Rahma Pradira Gesari Inayah Nur Utami Khairina Izzati Amalia Konita Septiasti

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