Wave Optics PYQs - Last 5 Years

In two separate setups for Biprism experiment using same wavelength, fringes of equal width are obtained. If ratio of slit separation is \(2: 3\) then the ratio of the distance between the slit and screen in the two setups is

In Young's double slit experiment the intensities at two points, for the path difference \(\frac{\lambda}{4}\) and \(\frac{\lambda}{3}\) (\(\lambda=\) wavelength of light used) are \(I_1\) and \(I_2\) respectively. If \(\mathrm{I}_0\) denot...

One of the slits in Young's double slit experiment is covered with a transparent sheet of thickness \(2.9 \times 10^{-3} \mathrm{~cm}\). The central fringe shifts to a position originally occupied by the \(25^{\text {th }}\) bright fringe. ...

In Young's double slit experiment when a glass plate of refractive index 1.44 is introduced in the path of one of the interfering beams, the fringes are displaced by a distance '\(y\)'. If this plate is replaced by another plate of same thi...

The ratio of intensities of two points on a screen in Young's double slit experiment when waves from the two slits have a path difference of \(\frac{\lambda}{4}\) and \(\frac{\lambda}{6}\) is
$$\left(\cos 90^{\circ}=0, \cos 60^{\circ}=0.5\r...

In biprism experiment, if \(5^{\text {th }}\) bright band with wavelength \(\lambda_1^{\prime}\) coincides with \(6^{\text {th }}\) dark band with wavelength \(\lambda_2{ }^{\prime}\) then the ratio $$\left(\frac{\lambda_2}{\lambda_1}\right...

In the experiment of diffraction due to a single slit, if the slit width is decreased, the width of the central maximum

A double slit experiment is immersed in water of refractive index 1.33. The slit separation is \(1 \mathrm{~mm}\), distance between slit and screen is \(1.33 \mathrm{~m}\) The slits are illuminated by a light of wavelength $$6300 \mathop A\...

In Young's double slit experiment, green light is incident on two slits. The interference pattern is observed on a screen. Which one of the following changes would cause the observed fringes to be more closely spaced?

In Young's double slit experiment, the fifth maximum with wavelength '\(\lambda_1\)' is at a distance '\(y_1\)' and the same maximum with wavelength '\(\lambda_2\)' is at a distance '\(y_2\)' measured from the central bright band. Then $$\f...

A beam of light of wavelength \(600 \mathrm{~nm}\) from a distant source falls on a single slit \(1 \mathrm{~mm}\) wide and the resulting diffraction pattern is observed on a screen \(2 \mathrm{~m}\) away. The distance between the first dar...

Two sources of light \(0.6 \mathrm{~mm}\) apart and screen is placed at a distance of \(1.2 \mathrm{~m}\) from them. A light of wavelength \(6000\,\mathop A\limits^o\) used. Then the phase difference between the two light waves interfering ...

In Young's double slit experiment the separation between the slits is doubled without changing other setting of the experiment to obtain same fringe width, the distance 'D' of the screen from slit should be made

A person is observing a bacteria through a compound microscope. For better observation and to improve its resolving power he should

Light waves from two coherent sources arrive at two points on a screen with path difference of zero and \(\frac{\lambda^{\prime}}{2}\). The ratio of intensities at the points is \(\left(\cos 0^{\circ}=1, \cos \pi=-1\right)\)

A parallel beam of monochromatic light falls normally on a single narrow slit. The angular width of the central maximum in the resulting diffraction pattern

In Young's double slit experiment, the two slits are 'd' distance apart. Interference pattern is observed on a screen at a distance 'D' from the slits. A dark fringe is observed on a screen directly opposite to one of the slits. The wavelen...

A parallel beam of monochromatic light falls normally on a single narrow slit. The angular width of the central maximum in the resulting diffraction pattern

In a Fraunhofer diffraction at a single slit of width 'd' and incident light of wavelength \(5500 \mathop A\limits^o\), the first minimum is observed at an angle \(30^{\circ}\). The first secondary maxima is observed at an angle \(\theta\),...