Two slits in Young's experiment have widths in the ratio 1:25.The ratio of intensity at the maxima and minima in the interference pattern Imax/Imin is
9/4
121/49
49/121
49/121
In an astronomical telescope in normal adjustment, a straight black line of length L is drawn on inside part of the objective lens. The eye - piece forms a real image of this line. The length of this image is I. The magnification of the telescope is
A.
A beam of light consisting of red, green and blue colours is incident on a right-angled prism. The refractive index of the material of the prism for the above red, green and blue wavelength are 1.39, 1.44 and 1.47
The Prism will
separate the blue colour part from the red and green colours
separate all the three colours from one another
not separate the three colours at all
separate the red colour part from the green and blue colours
On the first minimum adjacent to the central maximum of a single slit diffraction pattern, the phase difference between the Huygens wavelet from the edge of the slit and the wavelet from the midpoint of the slit is
π/4 radian
π/2 radian
π radian
π radian