Wave Optics Tes...

An interference is observed due to two coherent sources 'A'  & 'B' separated by a distance of 4$$\lambda$$ along the y-axis where $$\lambda$$ is the wavelength of the source. A detector D  is moved on the positive x-axis. The number of points on the x-axis excluding the points, x =0 & x =$$\infty$$  at which maximum will be observed is..--

In a young's double slit experiment, d = 1 mm, $$\lambda$$ = 6000 A and D = 1 m (where d, $$\lambda$$ and D have usal meaning). Each of slit individually produces same intensity on the screen. The minimum distance between two points on the screen having 75% intensity of the maximum intensity is: 

While an aquarium is being filled with water, a motionless fish looks up vertically through the surface of water at a monochromatic plane wave source of frequency $$f$$. If the index of refraction of the water is $$\mu$$ and the water level rises at a rate $$dh/dt$$, the shift in frequency which the fish observes, will then be :

In a Young's double slit experiment sources of equal intensities are used. Distance between slits is $$d$$ and wavelength of light used is $$\lambda (\lambda <<d)$$, Angular separation of nearest points on either side of central maximum where intensities become half of the maximum value is

Calculate the limit of resolution of a telescope objective having a diameter of 200 cm, if it has to detect light of wavelength 500 nm coming from a star ; -

Unpolarised light beam of intensity $$I_{0}$$ is incident on polaroid $$P_{1}$$. The three polaroids are arranged in such a way that transmission axis of $$P_{1}$$ and $$P_{3}$$ are perpendicular to each other. Angle between the transmission axis of $$P_{2}$$ and $$P_{3}$$ is $$60^{\circ}$$. The intensity of the beam coming out from $$P_{3}$$ will be

The near point of a long-sighted person is $$50\ cm$$ from the eye. Where can she see an object clearly:

In a Young's double slit experiment the slits are illuminated by a parallel beam of light from the medium of refractive index $$n_{1} = 1.2\ A$$ thin transparent film of thickness $$1.2\mu m$$ and refractive index $$n = 1.5$$ is placed infront of $$s_{1}$$ perpendicular to path of light. Wavelength of light measured in medium $$n_{1}$$ is $$400\ nm$$. The refractive index of medium between plane of slits and screen is $$n_{2} = 1.4$$. If the light coming from the film and $$s_{2}$$ have equal intensities $$I$$ then intensity at geometrical centre of the screen is :

In $$YDSE$$ experiment shown in the figure, a parallel beam of light of wavelength $$(\lambda = 0.3\ mm)$$ in medium $$\mu_{1}$$ is incident at an angle $$\theta = 30^{\circ}$$ as shown$$(S_{1}O = S_{2}O)$$. If the intensity due to each light wave at point $$O$$ is $$I_{0}$$ then the resultant intensity at point $$O$$ will be:

The YDSE apparatus is as shown in figure below. The condition for point $$P$$ to be a dark fringe is $$(\lambda =$$ wavelength of light waves) :