Home
Class 12
PHYSICS
A ray of light of refractive index 1.4ap...

A ray of light of refractive index `1.4`approaches the boundary surface between the liquids and air at an angle of incidence whose sine is `0.8`.Which of the following statements is correct about the behaviour of the light

A

It is impossible to predict the behaviour of the light ray on the basis of the information supplied.

B

The sine of the angle of refraction of the emergent ray will be less than 0.8

C

The ray will be internally reflected

D

The sine of the angle of refraction of the emergent ray will be greater than 0.8

Text Solution

Verified by Experts

The correct Answer is:
C
From Snell's law `1.4 xx "sin"x = 1 "sin"r`

`1.4 xx 0.8 = "sin"r gt 1` (which is not possible)
`implies` Ray will not refrect but it has total internal reflection . Hence(C).
Promotional Banner

Topper's Solved these Questions

  • GEOMETRICAL OPTICS

    ALLEN |Exercise EXERCISE-3|12 Videos

  • GEOMETRICAL OPTICS

    ALLEN |Exercise EXERCISE-04[A]|23 Videos

  • GEOMETRICAL OPTICS

    ALLEN |Exercise EXERCISE- 01|45 Videos

  • CURRENT ELECTRICITY

    ALLEN |Exercise EX.II|66 Videos

  • GRAVITATION

    ALLEN |Exercise EXERCISE 4|9 Videos

Similar Questions

Explore conceptually related problems

A ray of light is incident in situation as shown in figure. Which of the following statements is//are true?

You are given four sources of light each on providing a light of a single colour - red, blue green and yellow. Suppose the angle o refraction for a beam of yellow ligh corresponding to a particular angle o incidence at the interface of two media is 90° Which of the following statements is correct i the source of yellow light is replaced with tha of other lights without changing the angle o incidence ?

Unpolarised light is incident from air on a plane surface of a material of refractive index u! At a particular angle of incidence mu it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation ?

A ray of light travelling in a transparent medium falls on a surface separating the medium from air at an angle of incidence of 45 degree. The ray undergoes total internal reflection. If n is the refractive index of the medium with respect to air, select the possible value (s) of n from the following:

When a ray of light enters into the medium of refractive index of mu , angle of refraction is half of angle of incidence so angle of incidence = ......

A ray of light travelling in water is incident on its surface open to air. The angle of incidence is theta , which is less than the critical angle. Then there will be

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. A 600 nm light is perpendicularly incident on a soap film suspended in air. The film is 1.00 mum thick with n=1.35. Which statement most accurately describes the interference of the light reflected by the two surfaces of the film?

Unpolarized light of intensity I_(0) is incident on surface of a block of glass at brewster's angle. In that case, which one of the following statements is true-

(a) Figure 9.32 shows a cross-section of a 'light pipe' made of a glass fibre of refractive index 1.68. The outer covering of the pipe is made of a material of refractive index 1.44. What is the range of the angles of the incident rays with the axis of the pipe for which total reflections inside the pipe take place, as shown in the figure. (b) What is the answer if there is no outer covering of the pipe?

A ray of light is incident on the surface of a glass plate at an angle of incidence equal to Brewster's angle phi . If mu represents the refractive index of glass with respect to air, then the angle between reflected and refracted rays is

ALLEN -GEOMETRICAL OPTICS-EXERCISE-2
  1. Two thin slabs of refractive indices mu(1) and mu(2) are placed parall...

    Text Solution

    |

  2. A point source S is placed at the bottom of different layers as shown ...

    Text Solution

    |

  3. A ray of light of refractive index 1.4approaches the boundary surface ...

    Text Solution

    |

  4. A ray of light strikes a cubical slab surrounded by air as shown in th...

    Text Solution

    |

  5. A cubical block of glass of refractive index n1 is in contact with the...

    Text Solution

    |

  6. A beam of diameter 'd' is incident on a glass hemisphere. If the radiu...

    Text Solution

    |

  7. When the object is at distance u(1)andu(2)the images formed by the sa...

    Text Solution

    |

  8. A light ray hits the pole of a thin biconvex lens as shown in fig. The...

    Text Solution

    |

  9. A ray of light passes through a prism in a principle plane the deviati...

    Text Solution

    |

  10. The diagram shows five isosceles right angled prisms.A light ray incid...

    Text Solution

    |

  11. A certain prism is found to produce a minimum of38^(@).It produces a d...

    Text Solution

    |

  12. A ray incident at an angle 53^(@) on a prism emerges at an angle 37^(@...

    Text Solution

    |

  13. A man of height 170cmwants to see his complete image in a plane mirror...

    Text Solution

    |

  14. Two plane mirrors at an angle such that a ray incident on a mirror und...

    Text Solution

    |

  15. If the equation of mirror is given by y= 2//pi "sin"pix (y gt 0 , 0 le...

    Text Solution

    |

  16. In the fig. shown consider the first reflection at the plane mirror an...

    Text Solution

    |

  17. The figure shows a ray incident a angle i=pi//3 of the plot drawn show...

    Text Solution

    |

  18. A ray of light is incident normally on one face of 30^(@) - 60^(@) - 9...

    Text Solution

    |

  19. A curved surface of radius R separates two medium of refractive indice...

    Text Solution

    |

  20. A curved surface of radius R separates two medium of refractive indice...

    Text Solution

    |