Question 2 : ASSERTION (A):Hyugens' theory failed to&#160;explain polarization<br/>REASON (R): According to Hyugens' theory&#160;light is longitudinal wave<br/>

Question 3 : A beam of light is incident on a liquid of refractive&#160;index 1.40. The reflected rays are completely&#160;polarized. The angle of refraction of the beam&#160;is ($\tan 54.5^{\circ}=1.4$):<br/>

Question 4 : Consider the following statements A &amp; B. Identify the correct choice in the given answers.<br/>(A) The refractive Index of the extra-ordinary ray depends on the angle of incidence in double refraction<br/>(B) The vibrations of light waves acquire onesidedness for both ordinary and extraordinary rays in double refraction<br/>

Question 6 : A beam of light of wavelength $600\ nm$ from a distant source falls on a single slit $1\ mm$ wide and the resulting diffraction pattern is observed on a screen $2\ m$ away. The distance between the first dark fringes on either side of the central bright fringe is

Question 7 : White light reflected from a soap film(Refractive Index$=1.5$) has a maxima at $600$nm and a minima at $450$nm with no minimum in between. Then the thickness of the film is _____$\times 10^{-7}$m.

Question 8 : In a double slit experiment, the separation between the slits is d = 0.25 cm and the distance of the screen D = 100 cm from the slits, If the wavelength of light used is$\lambda = 6000\mathop {\text{A}}\limits^{\text{o}} \,{\text{and}}\,{{\text{I}}_{\text{0}}}$ is the intensity of the central bright fringe, the intensity at a distance$y = 4 \times {10^{ - 5}}$ m from the central maximum is

Question 9 : In Young's experiment, the wavelength of red light is $7800 \mathring { A }$ and that of blue light is $5200 \mathring { A }$. The value of $n$ for which $\left( n+1 \right) $th blue band coincides with $n$th red band is

Question 10 : Assertion: Thin films such as soap bubble or a thin layer of oil on water show beautiful colours when illuminated by white light. Reason: It happens due to the interference of light reflected from the upper surface of thin film.

Question 11 : An electron microscope gives higher magnifications than an optical microscope because.

Question 12 : In Young's double slit experiment, slits are separated by $2$mm and the screen is placed at a distance of $1.2$m from the slits. Light consisting of two wavelengths $6500$ $\overset{o}{A}$ and $5200$ $\overset{o}{A}$ are used to obtain interference fringes. Then the separation between the fourth bright fringes of two different patterns produced by the two wavelengths is?

Question 13 : The maximum number of possible interferencemaxima, for slit separation equal to twice thewavelength, in Young's double slit experiment is :<br>

Question 14 : In Young's double slit experiment the separation between the slits is halved and the distance between the slits and screen is doubled . The fringe width is:&#160;<br/>

Question 15 : Assertion: The unpolarised light and polarised light can be distinguished from each other by using polaroid. Reason: A Polaroid is capable of producing plane polarised beams of light.

Question 16 : In young's double slit experiment , the intensity of light coming form the first slit is double the intensity from the second slit.The ratio of the maximum intensity to the minimum intensity on the interference fringe pattern observed is.

Question 17 : White light reflected at normal incidence from a soap film has minima at $6500\overset {\circ}{A}$ and maxima at $7500\overset {\circ}{A}$ in the visible region with not minima in between. If $\mu$ is $\dfrac {5}{3}$ for the thin film, the thickness of film is :<br/>

Question 18 : The diameter of the objective lens of microscope makes an angle $'\beta\ '$ at the focus of the microscope. Further, the medium between the object and the lens is an oil of refractive index 'n'. Then the resolving power of the microscope.

Question 19 : In an experiment of single slit diffraction pattern, first minimum for red light coincides with first maximum of some other wavelength. If wavelength of red light is $6000 A^o$, then wavelength of first maximum will be