Home
Class 12
PHYSICS
A beam of converging rays from a point s...

A beam of converging rays from a point source would meet behind spherical mirror at a distance of 40 cm from it. But after reflection from the mirror the beam most at a point 20 cm from mirror. Is the mirror concave or convex? What is its focal length?

Text Solution

Verified by Experts

The correct Answer is:
concave, 40 cm
Promotional Banner

Topper's Solved these Questions

  • REFLECTION OF LIGHT

    CHHAYA PUBLICATION|Exercise PROBLEM SET - II|10 Videos

  • REFLECTION OF LIGHT

    CHHAYA PUBLICATION|Exercise HOTS NUMERICAL PROBLEMS|18 Videos

  • REFLECTION OF LIGHT

    CHHAYA PUBLICATION|Exercise SHORT ANSWER TYPE QUESTION -II|11 Videos

  • QUESTION PAPER OF WBCHSE 2019

    CHHAYA PUBLICATION|Exercise PART- B (SECTION-II)|4 Videos

  • REFRACTION OF LIGHT

    CHHAYA PUBLICATION|Exercise CBSE SCANNER|11 Videos

Similar Questions

Explore conceptually related problems

What will be amount of deviation of light ray after reflection from a plane mirror ?

The radius of curvature of a concave mirror is 30 cm. What is its focal length ?

A beam of converging rays is incident on a convex mirror of radius of curvature 30 cm and after reflection meet at a distance of 10 cm in front of the mirror. Where in absence of the mirror would the converiging rays meet? (in cm)

The focal-length of a spherical mirror of radius of curvature 20cm is

The focal leght of a spherical mirror is 40 cm. What is its radius of curvature ?

A beam of converging rays is incident on a convex mirror of focal length 30cm. In the absence of the mirror the converging rays would meet at a distance of 20cm from the pole of the mirror. If the mirror is situated at the said position where will the converging rays meet?

An object is placed at a distance of 25 cm from a concave mirror and a real image a formed by the mirror at a distance of 37.5 cm. The focal length of the mirror is

The image of a point object placed at 10 cm from a concave mirror, is formed at a distance of 20 cm from the mirror. If the object is moved towards the mirror by 0.1 cm then the image

A converging beam of rays meets at a point 15 cm in front of a convex mirror of radius of curvature 20 cm. In absence of the mirror where would the beam of rays meet?

If an object is placed at a distance of 40 cm from a concave mirror of focal length 20 cm , them the image wil be

CHHAYA PUBLICATION-REFLECTION OF LIGHT-PROBLEM SET - I
  1. A concave mirror forms an erect and there times magnified image on the...

    Text Solution

    |

  2. An arrow of length 15 cm is placed along the axis of a concave mirror....

    Text Solution

    |

  3. A beam of converging rays from a point source would meet behind spheri...

    Text Solution

    |

  4. The focal length of a concave mirror is 20 cm . Where should an object...

    Text Solution

    |

  5. What type of a spherical mirror is required to project the image of th...

    Text Solution

    |

  6. At what distance from a concave mirror an object should be placed to g...

    Text Solution

    |

  7. The diameter of the moon is about 2160 km . When the moon's distance f...

    Text Solution

    |

  8. A planet subtends an angle (6)/(pi) min at the pole of a concave mirro...

    Text Solution

    |

  9. An object is kept at a distance of 0.3 m from a concave mirror. If mag...

    Text Solution

    |

  10. A man wants to observe his own eye with the help of a concave mirror o...

    Text Solution

    |

  11. An object of size 5 cm is placed at a distance of 2 m from a concave ...

    Text Solution

    |

  12. An object is placed at a distance x from the principal focus of a sphe...

    Text Solution

    |

  13. The sun (diameter d) subtends an angle theta radian at the pole of a c...

    Text Solution

    |

  14. A narrow rod of length (f)/(3) is placed along the axis of a concave ...

    Text Solution

    |

  15. A square plate of side 4 cm is situated at a distance of 20 cm from a ...

    Text Solution

    |

  16. An object is kept in front of a concave mirror of focal length 15 cm. ...

    Text Solution

    |

  17. Find the position of an object which when placed in front of a concave...

    Text Solution

    |

  18. The image formed by a convex mirror is one third of the object. If th...

    Text Solution

    |

  19. A virtual image of half the size of the object is formed by a convex m...

    Text Solution

    |

  20. What will be the magnification of an object placed at 2f from the pole...

    Text Solution

    |