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What type of lens is used in Newton's Rings Experiment
Plano Convex lens is used in Newton's Rings Experiment
Why circular rings are formed?
Circular rings are formed because of the same thickness of air between the lens and glass plate.
What if we increase the wavelength of light?
Since diameter of ring is directly proportional to wavelength , diameter of ring will increase.
What is Newton's ring?
The phenomenon in which a interference pattern is created due to reflection from spherical surface and glass plate.
What is interference?
Phenomenon in which two coherent sources are combined.
What is function of 45 degree glass plate?
It turns the light rays coming from extended source to 90 degrees so te rays will fall normally on Plano Convex lens.
Types of interference?
Constructive and destructive interference.
What is fraunhoffer diffraction?
Fraunhoffer diffraction occurs when a plane wavefront is incident on the slit.
What is Fresnel diffraction?
Fresnel diffraction occurs when the light source is at finite distance from the slit.
What is diffraction?
The slight bending of light as it passes through edge of an object.
What is interference?
The phenomenon in which two or more waves superimpose to form a resultant wave.
What is grating element?
Grating element is the distance between two consecutive slits.
What is the use of collimeter?
Collimeter is used to obtain a plain wavefront.
What is the use of telescope?
Telescope is used to converge the light.
What is diffraction grating?
It is a glass plate ruled with parallel lines which produce spectrum on diffraction.
Types of wavefront
Spherical wavefront, plane wavefront, cylindrical wavefront.
What is spectrum?
Band of colours when a white light splits.
Which light scatters the most?
Red light , bcoz it has smaller wavelength.
What is coherence length?
Coherence length is the space over which the wave is sinusoidal.
What is temporal coherence?
If we consider two points in propagation of wave and phase difference between these points is constant then it is said to be temporal coherence.
What is Diffraction?
The slight bending of light when it passes through edge of the object is called diffraction.
What is spontaneous Emission?
When an atom in ground state absorbs certain amount of energy and goes to higher state and then falls back and then emits photon. This process is called spontaneous Emission.
What is Stimulated emission?
The emission of electromagnetic radiation in the form of photons triggered by photons of same frequency.
Properties of a laser?
Bright coherent monochromatic unidirectional
How does he ne laser work?
The hene mixture is exposed to radio frequency voltage . He absorbs energy and gets excited. It interacts with the neon atoms and transfer their energy. These neon atoms give stimulated radiations.