For the same objective, find the ratio of the least separation between two points to be distinguished by a microscope for light of and electrons accelerated through 100V used as the illuminating substance.
Given λ= = 5 ×10-7 m, V=100 V
Where dmin is the least separation, λ is the wavelength, n is the refractive index, β is the angle subtended.
De-Broglie wavelength of electron accelerated through Voltage is defined as
where h is the Planck’s constant, m is the mass of electron, e is the charge of electron and V is the Voltage
Substituting corresponding values we get,
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A. Distinguish between unpolarized light and linearly polarized light. How does one get linearly polarised light with the help of a polaroid?
B. A narrow beam of unpolarized light of intensity is incident on a polaroid The light transmitted by it is then incident on a second polaroid with its pass axis making angle of 60o relative to the pass axis of Find the intensity of the light transmitted by .
A. Explain two features to distinguish between the interference pattern in young’s double slit experiment with the diffraction pattern obtained due to a single slit.
B. A monochromatic light of wavelength 500 mm is incident normally on a single slit of width 0.2 mm to produce a diffraction pattern. Find the angular width of the central maximum obtained on the screen.
Estimate the number of fringes obtained in Young’s double slit experiment with fringe width 0.5 mm, which can be accommodated within the region of total angular spread of the central maximum due to single slit. (the wavelength of the light is given in mm but all the calculations are done using it as nm)Physics - Board Papers
(a) If one of two identical slits producing interference in Young’s experiment is covered with glass, so that the light intensity passing through it is reduced to 50%, find the ratio of the maximum and minimum intensity of the fringe in the interference pattern.
(b) What kind of fringes do you expect to observe if white light is used instead of monochromatic light?Physics - Board Papers
To ensure almost 100 per cent transitivity, photographic lenses are often coated with a thin layer of dielectric material. The refractive index of this material is intermediated between that of air and glass (which makes the optical element of the lens). A typically used dielectric film is MgF2 (n = 1.38). What should the thickness of the film be so that at the center of the visible spectrum (5500 Å) there is maximum transmission.Physics - Exemplar
Four identical monochromatic sources A, B, C, D as shown in the (Fig.10.7) produce waves of the same wavelength and are coherent. Two receiver R1 and R2 are at great but equal distances from B.
(i) Which of the two receivers picks up the larger signal?
(ii) Which of the two receivers picks up the larger signal when B is turned off?
(iii) Which of the two receivers picks up the larger signal when D is turned off?
(iv) Which of the two receivers can distinguish which of the sources B or D has been turned off?
Physics - Exemplar