Wave Optics Tes...

A light source approaches the observer with velocity 0.8C. The Doppler shift of or light of the wavelength $$5500\mathop {\rm{A}}\limits^{\rm{0}} $$ is:

In a young's double slit experiment , the distance between the two slits is 0.1mm and the wavelength of light used is 4$$\times 10^{-7}$$ m . If the width of the fringe on the screen is 4mm, then the distance between screen and slit is 

A photograph of the moon was taken with telescope. Later on, it was found that a housefly was siting on the objective lens of the telescope. In photograph

The interference pattern with two coherent light sources of density ratio $$n$$. In the interference pattern, the ratio $$\dfrac {I_{max}-I_{min}}{ I_{max}+I_{min}}$$ will be:

In a double slit experiment, the separation between the slits is d = 0.25 cm and the distance of the screen D = 100 cm from the slits, If the wavelength of light used is $$\lambda  = 6000\mathop {\text{A}}\limits^{\text{o}} \,{\text{and}}\,{{\text{I}}_{\text{0}}}$$ is the intensity of the central bright fringe, the intensity at a distance $$y = 4 \times {10^{ - 5}}$$ m from the central maximum is

Ray optics is valid when characteristic dimension are  

A broad source of light (l = 680 nm) illuminates normally two glass plates 120 mm long that touch at end and are separated by a wire 0.048 mm in diameter at the other end. The total number of bright fringes that appear over the 120 mm distance is:

Light of wavelength $$\lambda $$ from a point source falls on a small circular obstacle of diameter d. Dark and bright circular rings around a central bright spot are formed on a screen beyond the obstacle. The distance between the screen and obstacle is D. Then , the condition for the formation of rings, is

In Young's double slit experiment, the ratio of intensities of bright and dark frings is $$9$$. This means that 

In Young's double slit experiment , if the width of the slits are in the ratio $$4:9$$ the ratio of the intensity of maxima to the intensity at minima will be