Chapter 10 – Wave Optics
A parallel beam of light of wavelength 500 nm falls on a narrow slit and the resulting diffraction pattern is observe on screen 1 m away. It is observed that the first minimum is at a distance of 2.5mm from the centre of the screen. Find the width of the slit.
20
Nov
A parallel beam of light of wavelength 500 nm falls on a narrow slit and the resulting diffraction pattern is observe on screen 1 m away. It is observed that the first minimum is at a distance of 2.5mm from the centre of the screen. Find the width of the slit. What is the Brewster [...]
Two towers on top of two hills are 40 km apart. The line joining them passes 50 m above a hill halfway between the towers. What is the longest wavelength of radio waves, which can be sent between the towers without appreciable diffraction effects ?
20
Nov
Two towers on top of two hills are 40 km apart. The line joining them passes 50 m above a hill halfway between the towers. What is the longest wavelength of radio waves, which can be sent between the towers without appreciable diffraction effects ? Two towers on top of two hills are 40 km [...]
In double-slit experiment using light of wavelength 600 nm, the angular width of a fringe formed on a distant screen is 0.1^∘ . What is the spacing between the two slits?
20
Nov
In double-slit experiment using light of wavelength 600 nm, the angular width of a fringe formed on a distant screen is 0.1^∘ . What is the spacing between the two slits? In double-slit experiment using light of wavelength 600 nm the angular width of a fringe formed on a distant screen is 0.1^∘ . What [...]
You have learnt in the text how Huygens’ principle leads to the laws of reflection and refraction. Use the same principle to deduce directly that a point object placed in front of a plane mirror produces a virtual image whose distance from the mirror is equal to the object distance from the mirror.
20
Nov
You have learnt in the text how Huygens’ principle leads to the laws of reflection and refraction. Use the same principle to deduce directly that a point object placed in front of a plane mirror produces a virtual image whose distance from the mirror is equal to the object distance from the mirror. and (b) [...]
The 6563 A^0 Hα sign line emitted by hydrogen in a star is found to be red-shifted by 15A^0 . Estimate the speed with which the star is receding from the earth.
20
Nov
The 6563 A^0 Hα sign line emitted by hydrogen in a star is found to be red-shifted by 15A^0 . Estimate the speed with which the star is receding from the earth. The 6563 A^0 Hα sign line emitted by hydrogen in a star is found to be red-shifted by 15A^0 . Estimate the speed [...]
Light of wavelength 5000Å falls on a plane reflecting surface. What are the wavelength and frequency of reflected light ? For what angle of incidence is the reflected ray normal to the incident ray ?
20
Nov
Light of wavelength 5000Å falls on a plane reflecting surface. What are the wavelength and frequency of reflected light ? For what angle of incidence is the reflected ray normal to the incident ray ? Light of wavelength 5000Å falls on a plane reflecting surface. What are the wavelength and frequency of reflected light ? [...]
What is the Brewster angle for air to glass transition? (Refractive index of glass is 1.5).
20
Nov
What is the Brewster angle for air to glass transition? (Refractive index of glass is 1.5). What is the Brewster angle for air to glass transition? (Refractive index of glass is 1.5). November 20, 2020 Category: Chapter 10 - Wave Optics , NCERT Exemplar Class 12 , Physics ,
A beam of light consisting of two wavelengths 650 nm and 520 nm, is used to obtain interference fringes in a Young’s double slit experiment. (a) Find the distance of the third bright fringe on the screen from the central maximum for wavelength 650nm. (b) What is the least distance from the central maximum, where the bright fringes due to both the wavelength coincide ?
20
Nov
A beam of light consisting of two wavelengths 650 nm and 520 nm, is used to obtain interference fringes in a Young’s double slit experiment. (a) Find the distance of the third bright fringe on the screen from the central maximum for wavelength 650nm. (b) What is the least distance from the central maximum, where [...]
In a double slit experiment the angular width of a fringe is found to be 0.2^∘ on a screen placed I m away. The wavelength of light used in 600 nm. What will be the angular width of the fringe if the entire experimental apparatus is immersed in water ? Take refractive index of water to be 4/3.
20
Nov
In a double slit experiment the angular width of a fringe is found to be 0.2^∘ on a screen placed I m away. The wavelength of light used in 600 nm. What will be the angular width of the fringe if the entire experimental apparatus is immersed in water ? Take refractive index of water [...]
In Youngs double-slit experiment using monochromatic light of wavelength λ, the intensity of light at a point on the screen where path difference is λ, is K units. What is the intensity of light at a point where path difference is λ/3?
20
Nov
In Youngs double-slit experiment using monochromatic light of wavelength λ, the intensity of light at a point on the screen where path difference is λ, is K units. What is the intensity of light at a point where path difference is λ/3? In Youngs double-slit experiment using monochromatic light of wavelength λ is K units. [...]