If yellow light in the Youngs double slit experiment is replaced by red light the fringe width will:

Question

If yellow light in the Youngs double slit experiment is replaced by red light the fringe width will: (A) increase (B) decrease (C) remain unaffected (D) first increase and then decrease

Tardigrade Admin · Accepted Answer

Using the relation for fringe width β =(Dλ /2d) hence, β propto λ Since, λ red>λ yellow Therefore using the red light in place of yellow light, fringe width will increase.

Q. If yellow light in the Youngs double slit experiment is replaced by red light the fringe width will:

increase

decrease

remain unaffected

first increase and then decrease

Using the relation for fringe width $β = \frac{D λ}{2 d}$ hence, $β \propto λ$ Since, $λ_{re d} > λ_{ye ll o w}$ Therefore using the red light in place of yellow light, fringe width will increase.

Q. If yellow light in the Youngs double slit experiment is replaced by red light the fringe width will:

increase

decrease

remain unaffected

first increase and then decrease

Using the relation for fringe width β=2dDλ​ hence, β∝λ Since, λred​>λyellow​ Therefore using the red light in place of yellow light, fringe width will increase.

Using the relation for fringe width $β = \frac{D λ}{2 d}$ hence, $β \propto λ$ Since, $λ_{re d} > λ_{ye ll o w}$ Therefore using the red light in place of yellow light, fringe width will increase.