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प्रश्न
A green light is incident from the water to the air-water interface at the critical angle (C). Select the correct statement.
विकल्प
The entire spectrum of visible light will come out of the water at an angle of 90° to the normal.
The spectrum of visible light whose frequency is less than that of green light will come out to the air medium.
The spectrum of visible light whose frequency is more than that of green light will come out to the air medium.
The entire spectrum of visible light will come out of the water at various angles to the normal.
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उत्तर
The spectrum of visible light whose frequency is less than that of green light will come out to the air medium.
Explanation:
`sin i_C = 1/n` and `n prop 1/lambda`
For greater wavelength (i.e., lesser frequency) n is less. Hence, iC would be more. Thus, these wavelengths will not suffer internal reflection and come out at angles less than 90°.
संबंधित प्रश्न
i) Observe the given figure and answer the following questions.
a) Identify and write the natural process shown in the figure.
b) List the phenomena which are observe in this process.
c) Redraw the diagram and show above phenomena in it.
(i) Define critical angle.
(ii) State one important factor which affects the critical angle of a given medium.
(a) A ray of monochromatic light enters glass PQRS as shown in the fig. Complete the path of ray till it emerges from the glass. (Critical angle of glass is 420).
(b) Draw diagram of a prism periscope.
(c) What are the advantages of total internal reflecting prism over plane mirror?
What is meant by the term ‘critical angle’?
Which of the following is not involved in formation of a rainbow?
Explain ‘mirage’ as an illustration of refraction.
Solve Numerical example.
A monochromatic ray of light is incident at 37° on an equilateral prism of refractive index 3/2. Determine angle of emergence and angle of deviation. If angle of prism is adjustable, what should its value be for emergent rays to be just possible for the same angle of incidence?
For the same angle of incidence, the angle of refraction in four media A, B, C and D are 25°, 30°, 35° and 40° respectively. The speed of light is least in medium ______.
The angle of minimum deviation produced by a thin glass prism in air is 'δ'. If that prism is immersed in water, the angle of minimum deviation will be ______.
( aμg = refractive index of glass w.r.t, air aμw = refractive index of water w.r.t. air)
What are the conditions to achieve total internal reflection?
