In a modified Young's double slit experiment a monochromatic uniform and parallel beam of light of wave length 6000Å and intensity `(10/pi)Wm^(-2)` is incident normally on two circular apertures A and B of radii 20009Å and refractive index 1.5 for the wavelength of 6000Å is placed in front of aperture. A. Calculate the power (in watt) received at the focal spot F of the lens. The lens is symmertrically placed with respect to the apertures. Assume that 10% of the power received by each aperture goes in the originally direction and is brought to the focal spot.

In a modified Young's double-slit experiment, a monochromatic uniform and parallel beam of light of wavelength 6000 Å and intensity (10//pi) W m^(-2) is incident normally on two circular apertures A and B of radii 0.001 m and 0.002 m, respectively. A perfectly transparent film of thickness 2000 Å and refractive index 1.5 for the wavelength of 6000 Å is placed in front of aperture A (see the figure). Calculate the power (in mW) received at the focal spot F of the lens. Then lens is symmetrically placed with respect to the aperture. Assume that 10% of the power received by each aperture goes in the original direction and is brought to the focal spot.

The refractive index of glass is 1.5 for light waves of lambda = 6000 Å in vaccume. Calculate their wave length in glass.

Light of wavelength 5,000 Å is used in a microscope of numerical aperture 0.10. Calculate the resovlving power of the microscope.

A light has a wavelength 6000Å. The energy of this light is

Find the number of photons emitted per second by a 25 watt source of monochromatic light of wavelength 6000Å .

A parallel beam of uniform, monochromatic light of wavelength 6600 Å has an intensity of 900 Wm^(-2) . The number of photons in 1 mm^3 of this radiation are 1xx 10^(X) then find out value of X.

A light wave in air enters a medium of refractive index (4)/(3) . If the wavelength of light in air is 6000Å , then the wave number of light in the medium is

A parallel beam of light of wavelength 6000Å gets diffracted by a single slit of width 0.3 mm. The angular position of the first minima of diffracted light is :

In young's double slit experiment, the two slits are 0.2 mm apart. The fringes for light of wavelength 6000Å are found on the screen 80 cm away. The distance of fifth dark fringe, from the central fringe, will be