Home
Class 10
PHYSICS
Draw a cage on one side of a cardboard a...

Draw a cage on one side of a cardboard and a bird on the other side. Hang the cardboard with the help of a thread. Twist the thread and leave it. What do you see and why ?

Text Solution

Verified by Experts

The bird apperas to be inside the cage . This happens due to persistence of vision.
Promotional Banner

Topper's Solved these Questions

  • LENSES

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise Fill in the blanks and rewrite the statements|10 Videos

  • LENSES

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise Fill in the blanks for a convex lens|2 Videos

  • LAWS, RULES, UNITS AND DEFINITIONS

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise Carbon Compounds|18 Videos

  • MAKING CONCEPT DIAGRAMS

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise Cell Biology and Biotechnology|2 Videos

Similar Questions

Explore conceptually related problems

In an open-Utube, the pressure of a water column on one side is balanced by the pressure of a column of petrol on the other side. Compared to the height of the water column, the petrol column will have: (a) a higher (b) a lower, or (c ) the same height. Why ? If the height of water column is 15 cm, what is the height of the petrol column? density of petrol =0.68(g)/(cm^3) .

Try this Material: Convex lens, screen, metre scale, stand for the lens etc. Method: Keeping the screen fixed, obtain a clear image of a distant object like a tree or a building with the help of the lens on the screen. Measure the distance between the screen and the lens with the help of the metre scale. Now tum the other side of the lens towards the screen. Again obtain a clear image of the distant object on the screen by moving the lens forward or backward. Measure the distance between the screen and the lens again. What will happen if you use a concave lens in this experiment?

Take a piece of thread. Tie a small piece of stone to one end of the thread. Hold the other end of the thread in hand and whirl it round. Note the motion of the stone. If the thread breakes suddenly, the stone files off along tangent to the circle at the instant. Read the above passage and answer the following question: (i) which force is whirling the stone ? who is providing this force ? (ii) why does the stone fly off along the tangnet to the circle at that instant? (iii) what value of life do you learn from this?

In an experiment, Pooja used a equilateral triangular glass prism and projected a narrow beam of white light source from one side of the surface of the prism. She placed a screen on the other side and saw many colours appearing as patches on the screen. But when she used a red light source, she could only see a red patch on the screen. Similarly she used a blue and green light source and could only see one colour patch on both occasions. The reason why she could no see any other colour when the red light was used was because:

In an experiment, Pooja used a equilateral triangular glass prism and projected a narrow beam of white light source from one side of the surface of the prism. She placed a screen on the other side and saw many colours appearing as patches on the screen. But when she used a red light source, she could only see a red patch on the screen. Similarly she used a blue and green light source and could only see one colour patch on both occasions. She also could relate to another natural phenomenon that we observe on a rainy humid day as the sun comes out. What could be that phenomenon?

NAVNEET PUBLICATION - MAHARASHTRA BOARD-LENSES-Numerical Problems For Practice
  1. Draw a cage on one side of a cardboard and a bird on the other side. H...

    Text Solution

    |

  2. Find the focal length of a convex lens which produces a real image at ...

    Text Solution

    |

  3. Find the focal length of a convex lens which produces a virtual image ...

    Text Solution

    |

  4. A real image is obtained at 30 cm from a convex lens of focal length 7...

    Text Solution

    |

  5. An object is kept at 20 cm in front of a convex lens and its real imag...

    Text Solution

    |

  6. An object is kept at 20 cm in front of a convex lens and its real imag...

    Text Solution

    |

  7. An object is kept at 10 cm in front of a convex lens. Its imge is form...

    Text Solution

    |

  8. An object is kept at 10 cm in front of a convex lens. Its imge is form...

    Text Solution

    |

  9. An object is kept at 60 cm in front of convex lens of focal length 15 ...

    Text Solution

    |

  10. An object of height 2 cm is kept at 30 cm from a convex lens . Its rea...

    Text Solution

    |

  11. If the power of a lens is 4 dioptres , find its focal length.

    Text Solution

    |

  12. Find the power of a convex lens of focal length 40 cm.

    Text Solution

    |

  13. Find the power of a convex lens of focal length 12.5

    Text Solution

    |

  14. If for a lens, F=-20 cm, what is the power of the lens ?

    Text Solution

    |

  15. An object of height 4 cm in front of a concave lens of focal length 20...

    Text Solution

    |

  16. If two convex lenses of focal lengths 10 cm and 5 cm are kept in conta...

    Text Solution

    |

  17. If a convex lens of focal length 20 cm and a concave lens of focal len...

    Text Solution

    |

  18. If a convex lens of focal length 20 cm and a concave lens of focal len...

    Text Solution

    |

  19. If a convex lens of focal length 20 cm and a concave lens of focal len...

    Text Solution

    |

  20. A concave lens of focal length 12 cm and a convex lens of focal length...

    Text Solution

    |

  21. A concave lens of focal length 12 cm and a convex lens of focal length...

    Text Solution

    |