Physics
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. [...]
In a Young’s double-slit experiment, the slits are separated by 0.28 mm and the screen is placed 1.4 m away. The distance between the central bright fringe and the fourth bright fringe is measured to be 1.2 cm. Determine the wavelength of light used in the experiment.
20
Nov
In a Young’s double-slit experiment, the slits are separated by 0.28 mm and the screen is placed 1.4 m away. The distance between the central bright fringe and the fourth bright fringe is measured to be 1.2 cm. Determine the wavelength of light used in the experiment. and (b) Refracted light? Refractive index of water [...]
(a) The refractive index of glass is 1.5. What is the speed of light in glass? (Speed of light in vacuum is 3.0 × 10^8 ms^−1 ) (b) Is the speed of light in glass independent of the colour of light? If not, which of the two colours red and violet travels slower in a glass prism?
20
Nov
(a) The refractive index of glass is 1.5. What is the speed of light in glass? (Speed of light in vacuum is 3.0 × 10^8 ms^−1 ) (b) Is the speed of light in glass independent of the colour of light? If not, which of the two colours red and violet travels slower in a [...]
What is the shape of the wavefront in each of the following cases ? (a) Light diverging from a point source. (b) Light emerging out of a convex lens when a point source is placed at its focus. (c) The portion of the wavefront of light from a distant star intercepted by the Earth.
19
Nov
What is the shape of the wavefront in each of the following cases ? (a) Light diverging from a point source. (b) Light emerging out of a convex lens when a point source is placed at its focus. (c) The portion of the wavefront of light from a distant star intercepted by the Earth. A [...]
Monochromatic light of wavelength 589 nm is incident from air on a water surface. What are the wavelength, frequency and speed of (a) Reflected, and (b) Refracted light? Refractive index of water is 1.33.
19
Nov
Monochromatic light of wavelength 589 nm is incident from air on a water surface. What are the wavelength, frequency and speed of (a) Reflected, and (b) Refracted light? Refractive index of water is 1.33. and (b) Refracted light? Refractive index of water is 1.33. frequency and speed of (a) Reflected Monochromatic light of wavelength 589 [...]
Fig. shows an equiconvex lens (of refractive index 1.5) in contact with a liquid layer on top of a plane mirror. A small needle with its tip on the principal axis is moved along the axis until its inverted image is found at the position of the needle. The distance of the needle from the lens is measured to be 45.0cm. The liquid is removed and the experiment is repeated. The new distance is measured to be 30.0cm. What is the refractive index of the liquid ?
19
Nov
Fig. shows an equiconvex lens (of refractive index 1.5) in contact with a liquid layer on top of a plane mirror. A small needle with its tip on the principal axis is moved along the axis until its inverted image is found at the position of the needle. The distance of the needle from the [...]
Light incident normally on a plane mirror attached to a galvanometer coil retraces backwards a shown in Fig. A current in the coil produces a deflection of 3.5^∘ in the mirror. What is the displacement of the reflected spot of light on a screen placed 1.5 m away ?
19
Nov
Light incident normally on a plane mirror attached to a galvanometer coil retraces backwards a shown in Fig. A current in the coil produces a deflection of 3.5^∘ in the mirror. What is the displacement of the reflected spot of light on a screen placed 1.5 m away ? A screen is placed 90 cm [...]