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A beam of monochromatic blue light of wavelength 4200 Å in air travels in water (μ = 4 / 3). Its wavelength in water will be
On a glass plate a light wave is incident at an angle of 60o. If the reflected and the refracted waves are mutually perpendicular, the refractive index of material is
Velocity of light in glass whose refractive index with respect to air is and in certain liquid the velocity of light found to be . The refractive index of the liquid with respect to air is
A ray of light passes through four transparent media with refractive indices as shown in the figure. The surfaces of all media are parallel. If the emergent ray CD is parallel to the incident ray AB, we must have
For successive refraction through difference media μsinθ = constant
Here as θ is same in the two extreme media. Hence μ4 = μ1
A ray of light is incident at the glass–water interface at an angle i, it emerges finally parallel to the surface of water, then the value of μg would be
For glass water interface ......(i) and For water-air interface .....(ii)
The ratio of thickness of plates of two transparent mediums A and B is 6 : 4. If light takes equal time in passing through them, then refractive index of B with respect to A will be
A ray of light passes from vacuum into a medium of refractive index μ, the angle of incidence is found to be twice the angle of refraction. Then the angle of incidence is
A ray of light falls on the surface of a spherical glass paper weight making an angle a with the normal and is refracted in the medium at an angle β. The angle of deviation of the emergent ray from the direction of the incident ray is
A rectangular slab of refractive index μ is placed over another slab of refractive index 3, both slabs being identical in dimensions. If a coin is placed below the lower slab, for what value of μ will the coin appear to be placed at the interface between the slabs when viewed from the top
A coin is kept at bottom of an empty beaker. A travelling microscope is focussed on the coin from top, now water is poured in beaker up to a height of 10 cm. By what distance and in which direction should the microscope be moved to bring the coin again in focus
When water is poured in the beaker. Coin appears to shift by a distance
Hence to bring the coil again in focus, the microscope should be moved by 2.5 cm in upward direction
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