Home
Class 12
PHYSICS
A convex spherical refracting surfaces ...

A convex spherical refracting surfaces separates two media glass and air `(mu_g=1.5).` If the image is to be real, at what minimum distance u should the object be placed in air if R is the radius of curvature

A

`ugt3R`

B

`ugt2R`

C

`ult4R`

D

`ultR`

Text Solution

Verified by Experts

The correct Answer is:
B

`1.5/v-1.0/(-u)=(1.5-1.0)/(+R)`
or `1.5/v=(-1)/u+1/(2R)`
For image to real (for negative value of u) v should
be positive. Hence, `1/ult1/(2R) or ugt2R.`
Promotional Banner

Topper's Solved these Questions

  • REFRACTION OF LIGHT

    DC PANDEY|Exercise Single Correct Option|3 Videos

  • REFRACTION OF LIGHT

    DC PANDEY|Exercise more than one correct option|1 Videos

  • REFRACTION OF LIGHT

    DC PANDEY|Exercise Subjective Questions|8 Videos

  • REFLECTION OF LIGHT

    DC PANDEY|Exercise Subjective|9 Videos

  • SEMICONDUCTORS

    DC PANDEY|Exercise Subjective|12 Videos

Similar Questions

Explore conceptually related problems

Refraction takes place at a convex spherical boundary separating glass-air medium. For the image to be real, the object distance (mu_(g)=3//2) should be // is

Refraction takes place at a concave spherical boundary separating glass air medium. For the image to be real, the object distance (mu_(g)=3//2)

What acn be the largest distance of an image of a real object from a convex mirror of radius of curvature 20 cm

Refraction takes place at a convex spherical boundary separating air-glass medium. For the image to be real, the object distance (mu_(g) = 3//2) Note Object lying in the glass.

A spherical surface of radius R ssparates two media of refractive indices mu_(1) and mu_(1) as shown in figure., Where should an object be placed in medium 1 so that a real image is formed in medium 2 at the same distance?

The image of an object placed in air formed by a convex refracting surface is at a distance of 10 m behind the surface. The image is real and is at (2^(rd))/(3) of the distance of the object from the surface. The wavelength of light inside the surface is (2)/(3) times the wavelength in air. The radius of the curved surface is (x)/(13)m . The value of 'x' is _________.

The minimum sum of the distances of a real object and a real image from a concave mirror of radius of curvature 20cm is:

A convex mirror forms a real image 5 times the size of the object placed at a distance of 20 cm from it. The radius of curvature of the mirror is

Show that for refraction at a concave spherical surface (separating glass-air medium), the distance of the object should be greater than three times the radius of curvature of the refracting surface for the image to be real.

Radius of curvature of a concave spherical surface separating air-glass medium is R. A point object is placed on the principal axis in the glass (m_(g) = 1.5) . For the image to be real seen by observer in air, distance of the object from P should be

DC PANDEY-REFRACTION OF LIGHT-Level 2 Single Correct
  1. The maximum value of refractive index of a prism which permits the tra...

    Text Solution

    |

  2. A glass slab of thickness 4 cm contains the same number of waves as 5 ...

    Text Solution

    |

  3. If the optic axis of convex and concave lenses are separated by a dist...

    Text Solution

    |

  4. A light source S is placed at the centre of a glass sphere of radius R...

    Text Solution

    |

  5. A sphere (mu=4/3) of radius 1 m has a small cavity of diameter 1 cm at...

    Text Solution

    |

  6. An equi-convex lens of mu=1.5 and R=20 cm is cut into two equal parts ...

    Text Solution

    |

  7. As shown in the figure, region BCDEF and ABFG are of refractive index ...

    Text Solution

    |

  8. A point object O is placed at a distance of 20 cm from a convex lens o...

    Text Solution

    |

  9. A point object is placed at a distance of 20 cm from a thin plano-con...

    Text Solution

    |

  10. A flat glass slab of thickness 6 cm and index 1.5 is placed in front o...

    Text Solution

    |

  11. Distance of an object from the first focus of an equi-convex lens is 1...

    Text Solution

    |

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

    Text Solution

    |

  13. A concave mirror of focal length 2 cm is placed on a glass slab as sho...

    Text Solution

    |

  14. Two refracting media are separated by a spherical interfaces as shown ...

    Text Solution

    |

  15. A concavo-convex lens has refractive index 1.5 and the radii of curvat...

    Text Solution

    |

  16. A convex spherical refracting surfaces separates two media glass and ...

    Text Solution

    |

  17. An object is moving towards a converging lens on its axis. The image i...

    Text Solution

    |

  18. Two diverging lenses are kept as shown in figure. The final image form...

    Text Solution

    |

  19. In the figure shown , a point object O is placed in air on the princip...

    Text Solution

    |

  20. In the figure, a point object O is placed in air. A spherical boundry ...

    Text Solution

    |