Recently Active Optics Questions

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If wavelength of light changes inside water due to refraction, why does the colour of light not change? Thanx in advance... ...

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In the problem, I cannot do the marked ones. Please tell me how can I find the path difference in this problem for 2nd part. *Image* ...

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In YDSE the angular width of a fringe formed on distant screen is 10 the wavelength of light used is 6000Λ . What is the spacing between the slits? ...

A plane glass slab is kept over various colored letters, the letter which appears least raised is ...

[diamond have greater refractive index then glass] What will happen if we use a diamond slab instead of glass in plane mirrors ??? *Image* ...

A parallel sided block of glass of refractive index 1.5 which is 36 mm thick rests on the floor of a tank which is filled with water (refractive index = 4/3). The difference between apparent depth of floor at A & B when seen ...

A reflecting surface is represented by the equation Y=frac{2L}{pi }sin left( frac{pi x}{L} ight).~0le xle L . A ray travelling horizontally becomes vertical after reflection. The coordinates of the point (s) where this ray is ...

A parallel beam of sodium light of wavelength 6000 Λ is incident on a thin glass plate of μ= 1.5 such that angle of incidence in the plate is 600.The smallest thickness of the plate which will make it appear dark by reflect ...

A thin lens of focal length f and its aperture diameter d, forms a real image of intensity I. Now the central part of the aperture upto diameter (d/2) is blocked by an opaque paper. The focal length and image intensity woul ...

When a lens of power P ( in air ) made of material of refractive index mu is immersed in liquid of refractive index {{mu }_{0}} . Then the power of lens is: ...

A certain region of soap bubble reflects red light of wavelength 650nm in vaccum.What is the minmimum thickness that this region of the bubble could have? Take μ=1.41 ...

A fish rising vertically up towards the surface of water with speed 3 ms–1 observes a bird diving vertically down towards it with speed 9 ms–1. The actual velocity of bird is *Image* ...

A short linear object of length l lies along the axis of a concave mirror of focal length f at a distance u form the pole of the mirror. The size of the image is approximately equal to ...

why there is always a phase change of pie whenever reflection takes place? ...

A point object O is placed between two plan mirrors as shown is fig. The distance of the first three images formed by mirror from it are *Image* ...