Question

In a group, the ratio of doctors
to lawyers is 5:4. If the total
number of people in the group
is 72, what is
the number of lawyers in the
group?​

Answer 1

Solution :-

The wave length of the blue light is smaller than that of red light.

We Know,

$β = \frac{Dλ }{d}$

Therefore, when red light is replaced by blue light, the fringe width will decrease.

Hence, the answer is when red light is replaced by blue light, the fringe width will decrease.