Question

$\huge\mathfrak\red{Please Help}$​

Answer 1

Incident ray AB is partly reflected as ray 1 from the upper surface and partly reflected as ray 2 from the lower surface of the layer of thickness t and refractive index μ₁ = 1.8 as shown in figure path difference between the two rays would be Ax= 2u₁t 2 (1.8) t = 3.6t

Ray 1 is reflected from a denser medium, therefore, it undergoes a phase change whereas the ray 2 gets reflected from a rarer medium, therefore, there is no change in phase of ray 2.

For constructive interference Ax = (n-¹)^,, where n=1,2,3,4..

or 3.6t = (n-¹)^

lest value of t is corresponding to n = 1 or

t min = 2/ 2×3.6 or t min = 648/7.2 nm

t min = 90nm.

Answer 2

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Acceleration is the rate of change of velocity. Usually, acceleration means the speed is changing, but not always. When an object moves in a circular path at a constant speed, it is still accelerating, because the direction of its velocity is changing.