Light Travels Through A Glass Plate Of Thickness t and Having Refractive Indexμ. If c be The Velocity Of Light In Vacuum, The Time Taken By The Light To Travel This Thickness Of Glass Is:

Mirage is a phenomenon due to:

A plane glass slab is kept over various coloured letters; the letter which appears least raised is:

A ray of light from a denser medium strikes a rarer medium at an angle of incidence i. If the angle of reflection is r and the angle of refraction is r’and reflected and refracted rays make an angle of 90^o with each other, then the critical angle will be: 

The wavelength of light diminishes μ times in the medium. A diver from inside water (μ = 1.33) looks at an object whose natural colour is green. He sees the object as: 

Air has refraction index of 1.0003. The thickness of air column, which will have one more wavelength of yellow light (6000 Å) than in the same thickness of vacuum is: 

A ray of light travelling inside a rectangular glass block of refractive index  is incident on the glass-air interface at an angle of incidence of 45^o. The refractive index of air is one. Under these conditions the ray:

The critical angle of for light going from medium x into medium y is θ. The speed of light in medium x is v. The speed of light in medium y is:     

Monochromatic light of wavelength  travelling in a medium of refractive index n₁ enters a denser medium of refractive index n₂. The wavelength in the second medium is:    

When seen in green, the saffron and green portions of our national flag will appear to be: 

 are the electric permittivity and the magnetic permeability in a free space, ε and μ are the corresponding quantities in the medium, the index of refraction of the medium is: