Diffraction: Double slit vs Single slit

Question 1

For single-slit what is the difference between central maxima and subsidary

Answer 1

central maxima is twice the width of the subsidary maxima

Question 2

What are minima and maxima caused by

Answer 2

minima - destructive interference
maxima - constructive interference

Question 3

What is the equation for wavelength

Answer 3

lambda = dsin0min

Question 4

What happens if we increase wavelength of light

Answer 4

pattern gets wider

Question 5

what happens if we narrow the slit

Answer 5

widening of the pattern

Question 6

What happens for central maximum with single slit white light

Answer 6

white in the middle with red on either sides

Question 7

What happens for subsidary maximum with single slit white light

Answer 7

violet on the inside
red on the outside

Question 8

What is the size of central maximum compared to subsidary

Answer 8

2 x width of subsidary

Question 9

What was young’s double slit experiment

Answer 9

use two coherent source of light to produce interference pattern and prove light is a wave

Question 10

What is young’s equation

Answer 10

w = lamda * d / s

Question 11

What are all the values in youngs equation

Answer 11

w - fringe spacing
s - slit width
lambda - wavelength
D - distance of slit to screen

Question 12

What does the single slit in youngs experiment do

Answer 12

creates two slits coherent (same phase relationship)

Question 13

What happens with double slit width of maxmima

Answer 13

SAME widths throughout

Question 14

What happens to intensity of maxima the further from centre

Answer 14

falls with distance away