Question

Yellow light is used in single slit diffraction experiment with slit width $0.6mm$. If yellow light is replaced by X-rays, then the pattern will reveal:

• A. no diffraction pattern
• B. that the central maxima narrower
• C. less number of fringes
• D. more number of fringes

Answer 1

Answer: (D)

more number of fringes

Wavelength of X-Rays ranges from $0.1$ to $10nm$ and yellow light is in the range $570$ to $590nm$.

Hence, ${\lambda }_{X-ray}<{\lambda }_{yellow}$

Fringes are formed at $x_n=\frac{n\lambda D}{d}$

Hence, fringes of X-Rays are formed close to each other and more number of fringes.