Important Questions [26]
- Derive the conditions of maxima and minima due to interference of light transmitted from thin film of uniform thickness.
- Obtain the condition for maxima and minima of the light reflected from a thin transparent film of uniform thickness. Why is the visibility of the fringe much higher in the reflected system
- What is Antireflection Coating? What Should Be the Refractive Index and Minimum Thickness of the Coating?
- Derive the conditions of maxima and minima due to interference of light reflected from thin film of uniform thickness.
- What is meant by thin film? Comment on the colours in thin film in sunlight.
- A wedge shaped air film having angle 40 seconds is illuminated by monochromatic light. Fringes are observed vertically through a microscope.
- Explain how interference in wedge shaped film is used to test optical flatness of given glass plate.
- What will be the fringe pattern if wedge shaped air film is illuminated with white light?
- A wedged shaped air film having an angle of 40 seconds is illuminated by monochromatic light and fringes are observed vertically through a microscope.
- A Parallel Beam of Light of Wavelength 5890 A0 is Incident on a Glass Plate Having Refractive Index 𝝁=𝟏.𝟓 Such that the Angle of Refraction in the Plate is 600. Calculate the Smallest Thickness
- A Newtons Rings Setup is Used with a Source Emitting Two Wavelength λ1=6000a0 and λ2=4500 A0. It is Found that Nth Dark Ring Due to 6000a0 Coincides with (N+2)Th Dark Ring Due to 4500 A0.
- Why the Newton’s rings are circular and fringes in wedge shaped film are straight?
- With Newton’s ring experiment explain how to determine the refractive index of liquid.
- In Newtons’s ring experiment,what will be the order of dark ring which will have double the diameter of 40th dark ring?
- Explain Newton’S Ring Experiment and Show that Diameters of Nth Dark Rings Are Proportional to Square Root of Natural Numbers.
- With the Help of Proper Diagram and Necessary Equation, Explain How Newtons Ring Experiment is Useful to Determine the Radius of Curvature of Plano Convex Lens.
- Why the Newton’S Rings Are Circular and Centre of Interference Pattern (Reflected) is Dark?
- Describe in detail the concept of anti-reflecting film with a proper ray diagram.
- What is Diffraction Grating and Grating Element? Explain Experimental Method to Determine the Wavelength of the Spectral Line Using Diffraction Grating?
- Discuss the Fraunhoffer diffraction at single slit and obtain the condition for minima.
- Derive the Condition for Absent Spectra in Grating.
- What is grating and grating element?
- Explain the Experimental Method to Determine the Wavelength of Spectral Line Using Diffraction Grating.
- What is diffraction grating? What is the advantage of increasing the number of lines in the grating?
- What is Rayleigh’s criterion of resolution? Define resolving power of grating?
- Explain the experimental method to determine the wavelength of spectral lines using grating. A diffraction grating has 5000 lines / cm and the total ruled with is 5cm.
Concepts [19]
- Interference by Division of Amplitude and by Division of Wave Front
- Interference in Thin Film of Constant Thickness Due to Reflected and Transmitted Light
- Origin of Colours in Thin Film
- Wedge Shaped Film(Angle of Wedge and Thickness Measurement)
- Newton’S Rings
- Applications of Interference - Determination of Thickness of Very Thin Wire Or Foil
- Determination of Refractive Index of Liquid
- Wavelength of Incident Light
- Radius of Curvature of Lens
- Testing of Surface Flatness
- Anti-reflecting Films and Highly Reflecting Film
- Diffraction of Light
- Fraunhoffer Diffraction at Single Slit
- Fraunhoffer Diffraction at Double Slit
- Diffraction Grating
- Resolving Power of a Grating
- Dispersive Power of a Grating
- Application of Diffraction
- Determination of Wavelength of Light with a Plane Transmission Grating
