Home
Class 12
PHYSICS
A turnips sits before a thin coverging l...

A turnips sits before a thin coverging lens,outside the focal point of the lens.Teh lens is filled with a transparent gel so that it is flexible by,by squeezing its ends towards its center [as indicated in figure(a)],you can change the curvature of its front and rear sides

When you squeeze the lens,the lateral height of image.

A

(a)moves towards the lens

B

(b)moves away from the lens

C

(c)shifts up

D

(d)remains as it is

Text Solution

Verified by Experts

The correct Answer is:
A
On squeezing the lens, the focal length of lense decreases.
Promotional Banner

Topper's Solved these Questions

  • GEOMETRICAL OPTICS

    ALLEN |Exercise EXERCISE - 04 (A)|48 Videos

  • GEOMETRICAL OPTICS

    ALLEN |Exercise EXERCISE - 04 (B)|15 Videos

  • GEOMETRICAL OPTICS

    ALLEN |Exercise ASSERTION-REASON|40 Videos

  • CURRENT ELECTRICITY

    ALLEN |Exercise EX.II|66 Videos

  • GRAVITATION

    ALLEN |Exercise EXERCISE 4|9 Videos

Similar Questions

Explore conceptually related problems

A turnips sits before a thin coverging lens,outside the focal point of the lens.Then lens is filled with a transparent gel so that it is flexible by,by squeezing its ends towards its center [as indicated in figure(a)],you can change the curvature of its front and rear sides When you squeeze the lens,the lateral height of image.

A turnips sits before a thin coverging lens,outside the focal point of the lens.Then lens is filled with a transparent gel so that it is flexible by,by squeezing its ends towards its center [as indicated in figure(a)],you can change the curvature of its front and rear sides When you squeeze the lens,the lateral height of image.

For a thin convex lens when the heights of the object is double than its image, its object distance is equal to ....... Focal length of a lens is f.

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).

A thin equiconvex lens of glass of refractive index mu=3//2 & of focal length 0.3m in air is sealed into an opening at one end of a tank filled with water (mu=4//3) .On the opposite side of the lens ,a mirror is placed inside the tank on the tank wall perpendicular to the lens axis ,as shown in figure .the separation between the lens and the mirror is 0.8m A small object is placed outside the tank in front of the lens at a distance of 0.9 m form the lens along its axis .Find the position (relative to the lens)of the image of the object fromed by the stsyem.

A thin convex lens of focal length 'f' is put on a plane mirror as shown in the figure. When an object is kept at a distance 'a' from the lens - mirror combination,its image is formed at a distance (a)/(3) in front of the combination . The value of 'a' is :-

The adjacent figure shows a thin plano-convex lens of refractive index mu_1 and a thin plano-concave lens of refractive index mu_2 , both having same radius of curvature R of their curved surfaces. The thin lens of refractive index mu_3 has radius of curvature R of both its surfaces. This lens is so placed in between the plano-convex and plano-concave lenses that the plane surfaces are parallel to each other. The focal length of the combination is

Figure illustrates an aligned system consisting of three thin lenses. The system is located in air. Determine: (a) the position of the point of convergence of a parallel incoming from the left after passing through the system, (b) the distance between teh first lens and a point lying on the axis to the left of the system, at which that point and its image are located symmetrically with respect to the lens system.

One side of radius of curvature R_2=120 cm of a convexo-convex lens of material of refractive index mu=1.5 and focal length f_1=40 cm is slivered. It is placed on a horizontal surface with silvered surface in contact with it. Another convex lens of focal length f_2=20 cm is fixed coaxially d=10 cm above the first lens. A luminous point object O on the axis gives rise to an image coincide with it. Find its height above the upper lens.

The focal length of a thin biconvex lens is 20 cm . When an object is moved from a distance of 25 cm in front of it to 50 cm , the magni-fication of its image changes from m_(25) to m_(50) . The ratio (m_(25))/(m_(50)) is.

ALLEN -GEOMETRICAL OPTICS-Comprehension Based Questions
  1. The efficiency of a heat engine is defined as the ratio of the mechani...

    Text Solution

    |

  2. The efficiency of a heat engine is defined as the ratio of the mechani...

    Text Solution

    |

  3. A potato gun first a potato horizontally down a half-open cylinder of ...

    Text Solution

    |

  4. A potato gun first a potato horizontally down a half-open cylinder of ...

    Text Solution

    |

  5. When two plane mirrors subtend an angle theta between them, then a ray...

    Text Solution

    |

  6. When two plane mirrors subtend an angle theta between them, then a ray...

    Text Solution

    |

  7. When two plane mirrors subtend an angle theta between them, then a ray...

    Text Solution

    |

  8. A man of height H is standing in front of an inclined plane mirror at...

    Text Solution

    |

  9. A man of height H is standing in front of an inclined plane mirror at...

    Text Solution

    |

  10. A man of height H is standing in front of an inclined plane mirror at...

    Text Solution

    |

  11. A turnips sits before a thin coverging lens,outside the focal point of...

    Text Solution

    |

  12. A turnips sits before a thin coverging lens,outside the focal point of...

    Text Solution

    |

  13. A turnips sits before a thin coverging lens,outside the focal point of...

    Text Solution

    |

  14. The ciliary muscles of eye control the curvature of the lens in the ey...

    Text Solution

    |

  15. The ciliary muscles of eye control the curvature of the lens in the ey...

    Text Solution

    |

  16. The ciliary muscles of eye control the curvature of the lens in the ey...

    Text Solution

    |

  17. The ciliary muscles of eye control the curvature of the lens in the ey...

    Text Solution

    |

  18. The ciliary muscles of eye control the curvature of the lens in the ey...

    Text Solution

    |

  19. Light guidance in an optical fiber can be understood by considering a ...

    Text Solution

    |

  20. Light guidance in an optical fiber can be understood by considering a ...

    Text Solution

    |