The Fraunhoffer diffraction pattern of a single slit is observed with red light the source is then replaced with that of blue light. If the positions of the diffraction minima on the screen are to remain the same as before__________
A. the slit width must be decreased
B. the slit width must be increased
C. the lens-screen combination must be moved away from the slit.
D. the lens-source combination must be moved away from the slit
Answer:A
The Fraunhoffer diffraction pattern of a single slit is observed with red light the source is then replaced with that of blue light. If the positions of the diffraction minima on the screen are to remain the same as before__________
A. the slit width must be decreased B. the slit width must be increased C. the lens-screen combination must be moved away from the slit. D. the lens-source combination must be moved away from the slit