Wave Optics Tes...

In a Young's double slit experiment the slit separation is $$1\ mm$$ and wavelength of light used is $$6500\ \mathring { A }$$. The distance of the seventh bright fringe from the second dark fringe formed on a screen placed $$1\ m$$ away is

In Newton's rings experiment , light of wavelength 5890 A$$^{0}$$ is used the order of the dark ring produced where the thickness of the air film id  0. 589 mm is 

In a double slit experiment, the coherent sources are speed $$2d$$ apart and the screen is placed at a distance $$D$$ from the slit. If $$n^{th}$$ bright fringe is formed on the screen exactly opposite to $$a$$ slit, the value of $$n$$ must be

In a Fraunhoffer diffraction experiment at a single slit using light of wavelength $$400\ nm$$, the first minimum is formed at an angle of $$30^{\circ}$$. Then the direction $$\theta$$ of the first secondary maximum is

A man wants to see two poles, separately, situated at $$11 km$$. The minimum distance (approximately) between these poles will be

For most distinct interference patterns to be observed the necessary condition is that the ratio of intensities of light waves from the two coherent sources should be:

In the diagram shown, the separation between the slits is $$3 \lambda$$. If both slits are source of waves of amplitude $$A$$ then what is the resultant amplitude at the point $$P$$?

Two waves of same frequency and of intensity $$I_o$$ and $$9 I_o$$ produces interference. If at a certain point the resultant intensity is $$7 I_o$$ then the minimum phase difference between the two sound waves will be-

Ray optics is valid, when characteristics dimensions are .......

A point source of light is placed at origin, in air. The equation of wave front of the wave at time $$t$$, emitted by source at $$t=0$$, is (take refractive index of air as $$1$$ and speed of light to be $$e$$)