1.why it is not possible to have 100 % efficienct in a .
2.what is critical angle. how it is related to refractove index.
3.state 2 conditions where the work done by a force is zero.
4.state the energy change in loud speaker and photosynthesis. 5.what are 2 essential conditions for total internal reflection.
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1.it is not possible to have a machine hundred percent efficient because some part of its energy is lost in overcoming the friction and it is lossed in different forms of energy as sound, heat etc.
2.critical angle is the angle of incidence for which a ray of light passing through this angle from a denser medium to a rarer medium is totally reflected, means no refraction.
3.the work done by a force is zero when
(a) the displacement is zero
(b) the force acting is making an angle 90
4.in loud speaker the energy changes from electrical energy to sound energy. and in photosynthesis light energy to chemical energy.
5.(a) the light should pass from denser medium to rarer medium.
(b) the angle of incidence is greater than the critical angle.
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2.the angle of incidence should be greater than the critical angle
eg :mirage in desert and looming
Angle of incidence beyond which Ray's of light passing through a denser medium to surface of less dense medium are refracted but totally reflected is caled critical angle.
essential conditions for total internal reflection are:
1. light must travel from more denser medium to less denser medium
2. angle of incidence must be greater than critical angle.
For total internal reflection to take place (i) light must travel from a denser medium to a rarer medium and (ii) the angle of incidence inside the denser medium must be greater than the critical angle. i.e., ∠i>∠c.xplanation:
Total internal reflection happens when a ray of light strikes a medium boundary at an angle greater than a particular critical angle. There are two important condition for TIR to occur. First, the angle of incidence of the light ray must exceed the critical angle at the interface. Second, ray must travels from denser to rarer medium. The angle of incidence above which the total internal occurs is called critical angle.
the essential conditions are:
1) two different medium
2) angle should be greater than critical angle
3) light should travel from lighter medium to denser medium
•State two essential conditions of total internal reflection of light.
The two conditions for total internal reflection :
1. The ray of light must travel from a denser medium into a rarer medium.
2. The angle of incidence in the denser medium must be greater than the critical angle for that pair of media.
Critical angle is that angle of incidence in a denser medium, for which the angle of refraction in the rarer medium is 90 °.
•For the answer of second question please refer the attached image.
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total internal reflection: When a ray of light travelling in the denser medium is incident on the surface of the rarer medium, such that the angle of incidence is greater than the critical angle for the pair of media, the ray of light is completely reflected in the denser medium, this phenomenon is called TOTAL INTERNAL REFLECTION
conditions for total internal reflection are:
1 the light ray must travel from denser medium to rarer medium
and,2 the angle of incidence must be greater than the critical angle for the pair of media
★ answer ) For Total Internal Reflection two conditions are :
1.) Light should travel from denser to rarer medium .
2.) Angle of incidence ( i ) must be greater than the critical angle .
Real life example →
2) Optical fibres
3) Brilliance shining of Diamond
4) Porro Prisms
1. The ray must be travelling from a optically denser medium to a optically rarer medium.
2. The angle of incidence of the ray should be greater than the critical angle of the medium in which it is travelling.
1. On a hot sunny day, a driver may see a pool of water on a wet road.
2. In a desert, people often see a mirage.
3. A crack in a glass vessel often shines like a mirror.
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2.what is critical angle. how it is r...