Nature of Light
Important Easy Notes of Physics of Chapter No.9: Nature of Light written by Professor Mr. M. Talha Suib. These notes are very helpful in the preparation of Physics for students of the 11th class and these are according to the paper patterns of all Sindh Book Boards.
Summary and Contents:
Topics which are discussed in the notes are given below:
- Very Important Multiple Choice Questions (MCQs) with Answers of Chapter No.9: Nature of Light in Physics Class 11 Sindh Book Boards.
- Wave Front and Huygen’s Principle
- State and Explain Huygen’s Principle
- State and Explain Interference of Waves: Constructive Interference and Destructive Interference
- Conditions of Interference of Light
- State and Explain Young’s Double Slit Experiment
- Introduction and State Michelson’s Interferometer with Procedure, Calculation of Wavelength.
- Define and Explain Newton’s Rings: For Constructive Interference:( Bright Ring) and For Destructive Interference:( Dark Ring).
- Diffraction of Light, Fresnel Diffraction and Fraunhofer Diffraction.
- State and Explain Diffraction Grating.
- State and Explain Diffraction of X-rays
- State and Explain Polarization of Light
- Applications of Polarization of Light
- How many fringes will pass a reference point if the mirror of a Michelson’s interferometer is moved by
0.08 mm. The wavelength of light used is 5800 Ao .
- In a double slit experiment the separation of the slits is 1.9 mm and the fringe spacing is 0.31mm at a
distance of 1 metre from the slits. Find the wavelength of light?
- Interference fringes were produced by two slits 0.25 mm apart on a screen 150 mm from the slits. If
eight fringes occupy 2.62 mm. What is the wavelength of the light producing the fringes?
- Green light of a wavelength 5400 Ao is diffracted by grating having 2000 line/cm. (a) Compute the
angular deviation of the third order image. (b) Is a 10th order image possible?
- Light of a wavelength 6x10-7 m falls normally on a diffraction grating with 400 lines per mm. At what
angle to the normal are the 1st , 2nd and 3rd order spectra produced?
- If a diffraction grating produced a 1st order spectrum of light of wavelength 6x10-7 m at an angle of 20o
from the normal. What is its spacing and also calculate the number of lines per mm?
- Newton’s rings are formed between a lens and a flat glass surface of wavelength 5.88x10-7 m. If the
light passes through the gab at 30o to the vertical and the fifth dark ring is of diameter 9 mm. What is the
radius of the curvature of the lens?
- How far apart are the diffracting planes in a NaCl crystal for which X-rays of wavelength 1.54 A o make
a glancing angle of 15o -54’ in the 1st order?
- A parallel beam of X-rays is diffracted by rocksalt crystal the 1st order maximum being obtained when
the glancing angle of incidence is 6 degree and 5 minutes. The distance between the atomic planes of the
crystal is 2.8x10-10 m. Calculate the wavelength of the radiation.
- 271 fringes passed through a reference point when a movable mirror of Michelson interferometer is
moved by 0.08mm.Find the wavelength used in A0.
- A diffraction grating produces 3rd order spectrum of light of wavelength 7000 Ao at an angle of 30o
from the normal. What is the grating element? Calculate the number of lines per cm.
- If the radius of 5th dark ring Newton’s ring is 3mm when light of wavelength 5.89 x 10-7m is used,
what will be the radius of curvature of the lower surface of the lens used?
- If a diffraction grating produced a 3rd order spectrum of light of wavelength 7x10-7 m at an angle of
30o from the normal. What is its spacing and also calculate the number of lines per mm?
- In a double slit experiment, eight fringes occupy 2.62mm on a screen 145 mm away from the slits.
The wave length of light is 545nm. Find the slit separation.
- If the radius of the 14th bright Newton's ring is 1 mm and the radius of curvature of the lens is
125 mm, calculate the wavelength of the light.