Question

Bichromatic light of wavelengths ${\lambda }_1=5000A$ and ${\lambda }_2=7000A$ are used in YDSE. Then

• A. $9^{th}$ order maxima of ${\lambda }_1$ will coincide with ${10}^{th}$ order maxima of ${\lambda }_2$
• B. ${21}^{st}$ order maxima of ${\lambda }_2$ will coincide with ${15}^{th}$ order maxima of ${\lambda }_1$
• C. ${11}^{th}$ order minima of ${\lambda }_1$ will coincide with $8^{th}$ order minima of ${\lambda }_2$
• D. $3^{rd}$ order minima of ${\lambda }_1$ will coincide with $4^{th}$ order minima of ${\lambda }_2$

Answer 1

The correct option is C ${11}^{th}$ order minima of ${\lambda }_1$ will coincide with $8^{th}$ order minima of ${\lambda }_2$

The correct answer should be option c.