Wave Optics Tes...

The apparent wavelength of light from a star moving away from the earth is $$0.01\%$$ more than its real wavelength. The velocity of star is:

After reflection from a concave mirror, a plane wavefront becomes 

Calculate angular width of central maxima if $$\lambda = 6000 \mathring { A },$$ $$a = 18 \times 10^{-5} cm:$$

When light waves suffer reflection at the interface between air and glass , the  change of phase of the reflected wave is equal to 

A wave or a pulse is reflected normally from the surface of a denser medium back into the rarer medium. The phase change caused by the reflection-

A small coin is resting on the bottom of a beaker filled with a liquid. A ray of light from the coin travels upto the surface of the liquid and moves along its surface (see figure)How fast is the light travelling in the liquid?

Figure shows a glass plate placed vertically on a horizontal table with a beam of unpolarized light falling on its surface at $$57^\circ$$ with the normal. The electric vectors in the reflected light on the screen S will vibrate with respect to the plane of incidence:

When light is reflected normally from a uniform film of oil of refractive index $$\mu$$=$$1.33$$, an interference maxima occurs for $$6000\mathring{A}$$ and an interference minima occurs for $$4500 \mathring {A}$$ and no minima is observed in between. What is the thickness of the film?

In YDSE The intensity of central bright fringe is $$8mW/m^2$$. What will be the intensity at $$\lambda /6$$ path difference?

What is the minimum angular separation between two stars if a telescope is used to observe them with an objective of circular aperture $$20\ cm$$? The wavelength light used is $$5900\;\mathop {\text{A}}\limits^{\text{0}} .$$