Given data
wavelength λ=2.5 µm =2.5×10⁻⁶m
Diameter d=0.20 mm =0.20×10⁻³m
To find
Angle Θ in radians and degree
Solution
Circular apertures have first dark fringe at
Θ=(1.22λ)/d
Substitute the given values
So
Θ=[1.22(2.5×10⁻⁶m)]/0.20×10⁻³m
Θ=0.01525 rad
or
Θ=0.87°
And that’s why I think it might be C or D.
When light called the incident ray hits a mirror at any angle, it reaches 0˚ called the Normal line. The light bounces back at the same angle it entered but on the opposite side of the Normal.
<span>The light rays hitting concave mirror reflects back and converge at a point in front of it called the Focal Point. And beyond that point when the when rays comes to our eyes than due to convergence the objects looks bigger in size than its actual size. Due to this concave mirrors are used in back-view mirror in vehicles.</span>
The force acting on the passenger is equal to:
Where N is the normal force and mg is a force of gravity. If a person feels like their weight is increased by 60% at the bottom that means normal force is 60% stronger than the force of gravity:
We know that net force must be equal to the centripetal force: