✕
  1. Tardigrade
  2. Question
  3. Physics
  4. Angular width of central maximum in the Fraunhoffer's diffraction pattern is measured. Slit is illuminated by the light of another wavelength, angular width decreases by 30 %. Wavelength of light used is :

Q. Angular width of central maximum in the Fraunhoffer's diffraction pattern is measured. Slit is illuminated by the light of another wavelength, angular width decreases by . Wavelength of light used is :

Wave Optics Report Error

Solution:

For first diffraction min.
and if angle is small,

Angular width of first dark fringe from central maxima is

Full angular width of central maxima is

Also we can use



Questions from Wave Optics

1. Which of the following phenomena support the wave theory of light ?
(a) scattering
(b) interference
(c) diffraction
(d) velocity of light in a denser medium is less than the velocity of light in the rarer medium

KCET 2013

2. In Young's double slit experiment, how many maxima can be obtained on a screen (including central maxima), if (where is the wavelength of light)?

NTA Abhyas 2020

3. Light of wavelength is incident normally on a slit of width . The angular width of central maxima in the diffraction pattern is (measured from minimum to minimum)

NTA Abhyas 2020

4. Using monochromatic light of wavelength , an experimentalist sets up the Young's double slit experiment in three ways as shown.
If she observes that y = the wavelength of light used is :

JEE Main 2014

5. At two points P and Q on a screen in Young's double slit experiment, waves from slits and have a path difference of 0 and respectively. The ratio of intensities at P and Q will be :

AIEEE 2011

Physics Most Viewed Questions

1. If and respectively denote energy and gravitational constant, then has the dimensions of:

NEET 2021 Physical World, Units and Measurements

2. The de Broglie wavelength of an electron moving with kinetic energy of is nearly

NEET 2020 Dual Nature of Radiation and Matter

3. A car starts from rest and accelerates at At , a ball is dropped out of a window by a person sitting in the car. What is the velocity and acceleration of the ball at ? (Take

NEET 2021 Motion in a Straight Line

4. A wheel with metallic spokes each long is rotated with a speed of in a plane perpendicular to a magnetic field of . The induced emf between the axle and rim of the wheel will be,

NEET 2020 Electromagnetic Induction

5. A barometer is constructed using a liquid (density What would be the height of the liquid column, when a mercury barometer reads ?
(density of mercury

NEET 2020 Mechanical Properties of Fluids

Latest Updates