Question 406: Wave Optics

Question

In a double slit experiment, when light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed 1m away, was found to be 0.2
o
. What will be the angular width of the first minima, ($$\mu $$
water
= 4/3) if the entire experimental apparatus is immersed in water?

Accepted Answer

Angular fringe width (in air) $$	heta $$
air
= $${\beta  \over D}$$
Angular Fringe width (in water)
$$	heta $$
w
= $${\beta  \over {\mu D}} = {{{	heta _{air}}} \over \mu }$$
= $${{0.2^\circ } \over {{4 \over 3}}}$$ = 0.15
o

Answer

0.15
o

Answer

0.05
o

Answer

0.1
o

Answer

0.266
o

Wave Optics

In a double slit experiment, when light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed 1m away, was found to be 0.2 o . What will be the angular width of the first minima, ($\mu $ water = 4/3) if the entire experimental apparatus is immersed in water?

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