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When sunlight enters into a room filled ...

When sunlight enters into a room filled with dark smoke, its path becomes visible. Name the phenomenon responsible for this.

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The Tyndall effect.
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Thin films, including soap bubbles and oil slicks, show patterns of alternating dark and bright regions resulting from interference among the reflected light waves. If two waves are in phase their crest and troughs will coincide. The interference will be constructive and the aplitude of the resultant wave will be greater than the amplitude of either constituent wave. if the two waves are out of phase, the crests of one wave will coincide with the troughs of the other wave. The interference will be destructive and the amplitude of the resultant wave will be less than that of either constituent wave. at the interface between two transparent media some light is reflected and some light is refracted. * When incident light, reaches the surface at point a, some of the light is reflected as ray R_(a) and and some is refracted following the path ab to the back of the film. *At point b some of the light is refracted out of the film and part is reflected back refracted out of the fiml as ray R_(c) . R_(a) and R_(c) are parallel. However, R_(c) has travelled the extra distance within the film of abc. if the angle of incidence is small then abc is approximately twice the film's thickness. if R_(a) and R_(c) are in phase they will undergo constructive interference and the region ac will be bright if R_(a) and R_(c) are out of phase, they will undergo destructive interference. * Refraction at an interface never changes the phase of the wave. * For reflection at the interface between two media 1 and 2, if n_(1)ltn_(2) the reflected wave will change phase by pi . if n_(1)gtn_(2) the reflected wave will not undergo a phase change. for reference n_(air)=1.00 * if the waves are in phase after refection at all interfaces, then the effects of path length in the film are Constructive interference occur when (n= refractive index) 2t=mlamda//n" "m=0,1,2,3... .. Destructive interference occurs when 2t=(m+1//2)lamda//n" "m=0,1,2,3... Q. The average human eye sees colors with wavelengths between 430 nm to 680 nm. For what visible wavelength will a 350 nm thick n=1.35 soap film produce maximum destructive interference?

KUMAR PRAKASHAN-THE HUMAN EYE AND THE COLOURFUL WORLD-OBJECTIVE QUESTIONS AND ANSWERS (Answer the following questions in very short as directed (Miscellaneous) )
  1. A man is wearing spectacles of focal length +1 m. What can be the defe...

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  2. Which portion of a bi-focal lens is (a) a concave lens (b)a convex l...

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  3. When sunlight enters into a room filled with dark smoke, its path beco...

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  4. What is the function of the iris ?

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  5. What are light sensitive cells ?

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  6. What type of signals are generated and sent to the brain by light sens...

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  7. What holds the crystalline lens in the human eye?

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  8. Which part of the human eye helps in changing the thickness of the eye...

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  9. What is dispersion of white light ?

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  10. Give the main difference between the lens of the human eye and the len...

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  11. The image formed on the retina is inverted, but we see the object erec...

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  12. The absolute refractive index of a medium is 2.0. The speed of light i...

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  13. Match the column properly:

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  14. Match the following column:

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  15. The far point of a myopic eye is 100 cm. What is the focal length of t...

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  16. The near point of a hypermetropic eye is 75 cm. What is the focal leng...

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  17. The eye lens of human eye is a double convex lens. Agree or Disagree?

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  18. Cone-shaped retinal cells respond to the brightness or intensity of li...

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  19. Which property of vision is used in cinematography ?

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  20. What is aqueous humour ?

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