Home
Class 12
PHYSICS
Find the image shift if the paperweight ...

Find the image shift if the paperweight is inverted at its place so that the spherical surface touches the paper

Text Solution

Verified by Experts

The correct Answer is:
A, C
Here `, r=oo, u=-cm`
`mu_1=3/2, mu_2=1`
`v=?`
`1/v+3/(2xx3)=(mu_2-mu_1)/alpha` ltbr? `v=-2`
so, shift `=3-2=1cm from paper
Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

A 100 W light bulb is placed at the centre of a spherical chamber of radius 20cm. Assume that 60% of the energy supplied to the bulb is converted into light and that the surface of the chamber is perfectly absorbing. Find the pressure exerted by the light on the surface of the chamber.

A spherical surface of radius 30 cm separates two transparent media A and B with refractive indices 1'33 and 1.48 respectively. The medium A is on the convex side of the surface. Where should a point object be placed in medium A so that the paraxial rays become parallel after refraction at the surface ?

A lotus is 20 cm above the water surface in a pond and its stem is partly below the water surface . As the wind blew , the stem is pushed aside so that the lotus touched the water 40 cm away from the original position of the stem . How muc of the stem was below the water surface originally ?

A point source of light is placed at the centre of curvature of a hemispherical surface. The radius of curvature is r and the inner surface is completely reflecting. Find the force on the hemisphere due to the light falling on its if the source emits a power W.

The convex surface of a thin concave-convex lens of glass of refractive index 1.5 has a radius of curvature 20 cm. The concave surface has a radius of curvature 60 cm. The convex side is silvered and placed on a horizontal surface as shown in figure. (a) Where should a pin be placed on the axis so that its image is formed at the same place ? (b) If the concave part is filled with water (mu = 4/3), find the distance through which the pin should be moved so that the image of the pin again coincides with the pin.

A lens whose radii of curvature are different is forming the image of an object placed on its axis. If the surfaces of the lens facing the object and image are interchanged will the position of the image change?

Consider the situation described in the previous problem. Where should a point source be placed on the principal axis so that the two images form at the same place ?

A biconvex thin lens is prepared from glass (mu=1.5) , the two bounding surfaces having equal radii of 25 cm each. One of the surfaces is silvered from outside to make it reflecting. Where should an object be placed before this lens so that the image is formed on the object itself?

Find the radius of the smallest circle which touches the straight line 3x-y=6 at (1,-3) and also touches the line y=x . Compute up to one place of decimal only.

Side of a cube is 4cm. Find ratio of its total surface area and vertical surface area.

HC VERMA-GEOMETRICAL OPTICS-Exercises
  1. One end of a cylindrical glass rod (mu = 1.5) of radius 1.0 cm is roun...

    Text Solution

    |

  2. A paperweight in the form of a hemisphere of radius 3.0 cm is used to ...

    Text Solution

    |

  3. Find the image shift if the paperweight is inverted at its place so th...

    Text Solution

    |

  4. A hemispherical portion of the surface of a solid glass sphere (mu = 1...

    Text Solution

    |

  5. The convex surface of a thin concave-convex lens of glass of refractiv...

    Text Solution

    |

  6. A double convex lens has focal length 25 cm. The radius of curvature o...

    Text Solution

    |

  7. The radii of curvature of a lens are + 20 cm and + 30 cm. The material...

    Text Solution

    |

  8. Lenses are constructed by a material of refractive indeic 1'50. The ma...

    Text Solution

    |

  9. A thin lens made of a material of refractive indexmu2 has a medium of ...

    Text Solution

    |

  10. A convex lens has a focal length of 10 cm. Find the location and natur...

    Text Solution

    |

  11. A slide projector has to project a 35 mm slide (35 mm xx 23 mm) on a 2...

    Text Solution

    |

  12. A particle executes a simple harmonic motion of amplitude 1.0 cm along...

    Text Solution

    |

  13. An extended object is placed at a distance of 5.0 cm from a convex len...

    Text Solution

    |

  14. A pin of length 2.00 cm is placed perpendicular to the principal axis ...

    Text Solution

    |

  15. A convex lens produces a double size real image when an object is plac...

    Text Solution

    |

  16. A pin of length 2.0 cm lies along the principal axis of a converging l...

    Text Solution

    |

  17. The diameter of the sun is 1.4 X 10^9m and its distance from the earth...

    Text Solution

    |

  18. A 5.0 diopter lens forms a virtual image which is 4 times the object p...

    Text Solution

    |

  19. A diverging lens of focal length 20 cm and a converging mirror of foca...

    Text Solution

    |

  20. A converging lens of focal length 12 cm and a diverging mirror of foca...

    Text Solution

    |