Question 35
A two-source interference experiment uses the apparatus
shown.
What is the main purpose of the single slit?
A
to make a narrow beam
of light
B
to make the same
amplitude of light incident on each slit
C
to provide coherent
light
D to
provide monochromatic light
Reference: Past Exam Paper – June 2018 Paper 12 Q29
Solution:
Answer:
C.
The purpose of the single
slit is to provide coherent light.
Coherent light have a constant
phase difference.
Light is emitted in all
directions (diverging) from the lamp. In the absence of the single slit, light from
the lamp (diverging rays) would pass through the double slit, resulting in a
variety of different phase differences at the screen.
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