Question 1 :
The helical structures of nucleic acids can be studied by using :<br/>
Question 2 :
The critical angle for total internal reflection for a substance is $45^{\circ}$. The polarizing angle for this substance is ($\tan 54^{\circ}44'=\sqrt{2}$) :<br/>
Question 3 :
When unpolarised light passes through a Polaroid sheet the beam that emerges from it is plane polarized. This is due to selective :<br/>
Question 4 :
When an unpolarised light is polarized, then the intensity of light of the polarized wave :<br/>
Question 5 :
The angle of incidence at which reflected light is totally polarised for reflection from air to glass (refractive index $n$) is :<br>
Question 6 :
A Polaroid is placed at $45^0$ to an incoming light of intensity $I_0$. Now the intensity of light passing through Polaroid after polarization would be
Question 7 :
Unpolarised light of intensity 32 W m$^{-2}$ passes through three polarizes is crossed with that of the first. The intensity of final emerging light is 3 Wm$^{-2}$. The intensity of light transmitted by first polarizer will be
Question 8 :
In YDSE distance between slits and screen is $1.5m$. When the light of wavelength $500nm$ is used then $2^{nd}$ bright fringe is obtained on screen at a distance of $10mm$ from the central bright fringe. What will be the shift in the 2nd bright fringe of the light of wavelength $550nm$ is used?
Question 9 :
In YDSE, the amplitude of intensity variation of the two sources is found to be $5%$ of the average intensity. The ratio of the intensities of two interfering sources is
Question 10 :
In a double slit interference experiment, the fringe width obtained with a light of wavelength $5900\overset{o}{A}$ was $1.2\ mm$ for parallel narrow slits placed $2\ mm$ apart. In this arrangement, if the salt separation is increased by one-and-half times the previous value, then the fringe width is:<br/>
Question 11 :
In a double-slit experiment, at a certain point on the screen the path difference between the two interfering waves is $\cfrac { 1 }{ 8 } th$ of a wavelength. The ratio of the intensity of light at that point to that at the centre of a bright fringe is:
Question 12 :
The heavenly body is receding from earth, such that the fractional change in $\lambda$ is $1$, then its velocity is :
