Wave Optics » Exercise – 1
1. The velocity of light is maximum in :
(a) Diamond
(b) Water
(c) Vacuum
(d) Glass
2. The speed of light in vacuum depends upon :
(a) Colour
(b) Wavelength
(c) frequency
(d) None of these
3. Which of the following has the longest wavelength :
(a) Blue light
(b) X-rays
(c) White light
(d) Red light
4. Light wave can travel through vacuum but not sound waves because :
(a) Light waves show particle nature
(b) They show wave nature
(c) They are longitudinal
(d) They are transverse
5. When a ray of light travels from one medium to another medium and bent towards the normal then this phenomenon is known as :
(a) Reflection
(b) Refraction
(c) Diffraction
(d) Total internal reflection
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- Physics » Notes » Reflection Reflection : When a ray of light falls on a surface and returned into the same media, then this phenomenon, is called reflection of light. Laws of Reflection : The reflection at a plane surface always takes place in accordance with the following two laws : (i) The incident ray, the reflected ray and normal to surface at the point of incidence all lie in the same plane. (ii) The angle of incidence, i is equal to the angle of reflection r, i. e., ∠i = ∠r. Figure-1 : Reflection Where, i = Angle of incidence r = Angle of reflection #Note : 1. After reflection velocity, wavelength and frequency of light remains same but intensity decreases. 2. If light ray incident normally on a surface, after reflection it retraces the path. Total Internal Reflection : When Angle of incidence exceeds the critical angle than light ray comes back in to the same medium after reflection from interface. This phenomenon is called Total internal reflection. When a ray of light goes from denser to rarer medium it bends away from the normal and as the angle of incidence in denser medium increases, the angle of refraction in rarer medium also increases and at a…
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