Home
Class 12
PHYSICS
An image I is formed of point object O b...

An image I is formed of point object O by a lens whose optic axis is AB as shown in figure.

(a) State whether it is a convex lens or concave?
(b) Draw a ray diagram to locate the lens and its focus.

Text Solution

Verified by Experts

(i) Concave lens always forms an erect image. The given image I is on the other
side of the optic axis. Hence, the lens is convex.
(ii) Join O with I. Line OI cuts the optic axis AB at optical centre (P) of the lens. The dotted line
shows the position of lens.

From point O, draw a line parallel to AB. Let it cut the dotted line at M. Join M with I. Line
MI cuts the optic axis at focus (F) of the lens.
Promotional Banner

Topper's Solved these Questions

  • REFRACTION OF LIGHT

    DC PANDEY ENGLISH|Exercise Example Type 10|1 Videos

  • REFRACTION OF LIGHT

    DC PANDEY ENGLISH|Exercise Example Type 11|3 Videos

  • REFLECTION OF LIGHT

    DC PANDEY ENGLISH|Exercise Subjective|9 Videos

  • SEMICONDUCTORS

    DC PANDEY ENGLISH|Exercise Subjective|12 Videos

Similar Questions

Explore conceptually related problems

An image I is formed of a point object O by a mirror whose principal axis is AB as shown in figure. (a) State whether it is a convex mirror or a concave mirror . (b)Draw a ray diagram to locate the mirror and its focus . Write down the step of construction of the ray diagram. Consider the possible two cases. (1) When distance of I from AB is more than the distance of O from AB and (2) When distance of O from AB is more than the distance of I from AB

An image Y is formed of a point object x by a lens whose optic axis is AB as shown in Figure. Draw a ray diagram to locate the lens and its focus. If the image Y of object X is formed by a concave mirror (having the same optic axis AB) instead of lens, draw another ray diagram to locate the mirror and its focus. Write down the steps of construction of the ray diagrams.

A virtual, diminished image is formed when an object is placed between the optical centre and the principal focus of a lens. Draw a ray diagram to show the formation of the image with the above stated characteristics.

AB is the optic axis of a lens. Lens is not shown in the figure. O and I are the position of object and image. Then match of following.

A linear object is placed on the axis of a lens. An image is formed by refraction in the lens. For all positions of the object on the axis of the lens, the positions of the image are always between the lens and the object. (i) Name the lens. (ii) Draw a ray diagram to show the formation of the image of an object placed in front of the lens at any position of your choice except infinity.

A lens forms an upright and diminished image of an object when the object is placed at the focal point of the given lens. Draw a ray diagram to show the image formation.

A lens produces a virtual image between the object and the lens. Draw a ray diagram to show the formation of this image.

The redius of curvature of the convex face of a plano-convex lens is 12cm and its refractive index is 1.5. a. Find the focal length of this lens. The plane surface of the lens is now silvered. b. At what distance form the lans will parallel rays incident on the convex face converge? c. Sketch the ray diagram to locate the image, when a point object is places on the axis 20cm from the lens. d. Calculate the image distance when the object is placed as in (c).

The figure shows an arrangement of an equi-convex lens and a concave mirror. A point object O is placed on the principal axis at a distance 40 cm from the lens such that the final image is also formed at the position of the object. If the radius of curvature of the concave mirror is 80 cm, find the distance d. Also draw the ray diagram. The focal length of the lens in air is 20 cm.

A convex lens of focal length 10 cm and a concave lens of same focal length in value are placed co-axially at a separation of 20 cm as shown in figure. A point object is at infinity on the principal axis. Take the optic center of convex lens as origin of co ordinate system and the principal axis as x-axis as shown in figure. In the initial positin (as given in the passage ) if the concave lens has a velocit of 9 cm/s towards the convex lens, the velocity of the final image will be

DC PANDEY ENGLISH-REFRACTION OF LIGHT-Level 2 Subjective
  1. An image I is formed of point object O by a lens whose optic axis is A...

    Text Solution

    |

  2. a. Figure (a) shows the optical axis of a lens, the point source of ...

    Text Solution

    |

  3. a. Figure (a) shows the optical axis of a lens, the point source of ...

    Text Solution

    |

  4. In Figure, a fish watcher watches a fish through a 3.0 cm thick glass ...

    Text Solution

    |

  5. A concave spherical mirror with a radius of curvature of 0.2 m is fill...

    Text Solution

    |

  6. A lens with a focal length of f=30 cm produces on a screen a sharp ima...

    Text Solution

    |

  7. One side of radius of curvature R2=120 cm of a convexo-convex lens of ...

    Text Solution

    |

  8. A small object is placed on the principal axis of concave spherical mi...

    Text Solution

    |

  9. A thin glass lens of refractive index mu2=1.5 behaves as an interface ...

    Text Solution

    |

  10. A glass hemisphere of radius 10 cm and mu=1.5 is silvered over its cur...

    Text Solution

    |

  11. A equilateral prism of flint glass (mug=3//2) is placed water (muw=4//...

    Text Solution

    |

  12. Rays of light fall on the plane surface of a half cylinder at an angle...

    Text Solution

    |

  13. The figure shows an arrangement of an equi-convex lens and a concave m...

    Text Solution

    |

  14. A convex lens is held 45 cm above the bottom of an empty tank. The ima...

    Text Solution

    |

  15. A parallel beam of light falls normally on the first face of a prism o...

    Text Solution

    |

  16. Two converging lenses of the same focal length f are separated by a di...

    Text Solution

    |

  17. A cubical vessel with non-transparent walls is so located that the eye...

    Text Solution

    |

  18. A spherical ball of transparent material has index of refractionmu. A ...

    Text Solution

    |

  19. A ray incident on the droplet of water at an angle of incidence i unde...

    Text Solution

    |

  20. A transparent solid sphere of radius 2 cm and density rho floats in a ...

    Text Solution

    |

  21. A hollow sphere of glass of inner and outer radii R and 2R respectivel...

    Text Solution

    |