Demonstrate diffraction round and straight edge in a ripple tank.

Consider fraunhoffer diffraction pattern obtained with a single slit illuminated at normal indicent. At the angular position of the first diffraction minimum the phase different between the wavelets from the opposite edge of the slits is

Refraction of light at air - water interface Put a straight pencil into a tank of water or breaker of water at an angle of 45^@ and look at it from one side and above. How does the pencil look now?

A paralel beam of light of wavelength lambda is incident normally on a narrow slit.A diffraction pattern is formed on a screen placed perpendicular to the direction of the incident beam.At the second minimum of the diffraction pattern.the phase difference between the rays coming from from the two edges of slit is

A ripple tank demostrates the effect of two water being added together. The two waves are described by h=8 cost and h=6 sint , where t in [0,2pi) is in second and h is the height in millimeters above still water. Find the maximum height of the resultant wave and the value of t at which it occurs.

At the first minimum adjacent to the central maximum ofa single-slit diffraction pattern the phase difference between the Huygen’s wavelet from the edge of the slit and the wavelet from the mid point of slit is.

Answer the following questions: (e) Ray optics is based on the assumption that light travels in a straight line. Diffraction effects (observed when light propagates through small apertures/slits or around small obstacles) disprove this assumption. Yet the ray optics assumption is so commonly used in understanding location and several other properties of images in optical instruments. What is the justification?

One end of a horizontal cylindrical glass rod (mu=1.5) of radius 5.0 cm is rounded in the shape of a hemisphere. An object 0.5 mm high is placed perpendicular to the axis of the rod at a difference of 20.0 cm from the rounded edge. Locate the image of the object and find its height.