Plant propagation: Sexual and Asexual propapagation.pptx
Diffraction at a slit and heisenberg
1. Diffraction at a slit and Heisenberg’s uncertainty principle
Using a slit width of 0.20 mm located at a distance of 12 m away from the screen, find
the wavelength of the laser light used in producing the diffraction pattern.
Refractive index of a transparent glass plate
Find the refractive index of the given glass plate (t=1.17 mm) by measuring the angle of
rotation for the glass plate to make 20 dark rings disappear at the center of the ring
pattern.
Newton’s rings
Find the wavelength of the light used in nm by taking the appropriate measurements for
the 3rd dark ring produced by yellow sodium light.
Newton’s rings
Evaluate the refractive index of the convex lens material used to obtain Newton’s rings by
taking the appropriate measurements for the 6th order dark ring obtained by green laser
light of wavelength equals to 530 nm. Take “+2 cm” as the focal length of the lens.
Fresnel’s diffraction via the Zone plate
Find the wavelength of the light used by measuring the proper image distance at the
principal focal plane for the zone plate. The radius of the 7th darkened zone is equal to
0.0443351 cm and it is 2.2 m away from the object.
Determination the thickness of a paper via air wedge interference
Calculate the thickness of the given paper using the air wedge by taking travelling
microscope measurements for the n=2 and n=4 dark fringes. The sodium yellow light of
589.3 nm wavelength is used in the experiment.
2. Optical activity of an optically active solution using half – shade penumbra polarimeter
Starting with a sugar solution of 0.1333 g/cm3, estimate the optical activity S by taking
one measurement only using the half – shade polarimeter.
Diffraction grating and the dispersion and resolving powers
Find the wavelength of the red spectral line in the 2 nd order spectrum for the given grating
of 50 lines per mm.
The photovoltaic cell
Calculate both theoretically and experimentally, the ratio of the light transmitted to the light
incident on the analyzer when the transmission axis of the analyzer is 45 degrees with
respect that of the polarizer.
