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Define the principal focus of a concave ...

Define the principal focus of a concave mirror.

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**Step-by-Step Solution:** 1. **Understanding the Concave Mirror**: - A concave mirror is a spherical mirror that curves inward, resembling a portion of the interior of a sphere. 2. **Principal Axis**: - The principal axis is an imaginary line that runs perpendicular to the surface of the mirror and passes through its center of curvature and the mirror's vertex. ...
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An object is present on the principal axis of a concave mirror at a distance 30cm from it. Focal length of mirror is 20cm. Q. If object starts moving with 2cms^(-1) perpendicular to principal axis above the principal axis then,

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Knowledge Check

  • An object is kept on the principal axis of a concave mirror of focal length 10cm, at a distance of 15 cm from its pole. The image formed by the mirror is:

    A
    Virtual and magnified
    B
    Virtual and diminished
    C
    Real and magnified
    D
    Real and diminished

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    A point object is moving on the principal axis of a concave mirror of focal length 24 cm towards the mirror. When it is at a distance of 60 cm from the mirror, its velocity is . 9 sec// cm What is the velocity of the image at that instant

    The image of an object placed on the principal axis of a concave mirror of focal length 12 cm is formed at a point which is 10cm more distance form the mirror than the object. The magnification of the image is

    (a) A mobile phone lies along the principal axis of a concave mirror. Show, with the help of a suitable diagram, the formation of its image. Explain why magnification is not uniform. (b) Suppose the lower half of the concave mirror's reflecting surface is covered with an opaque material. What effect this will have on the image of the object? Explain.

    A point object is placed on the principal axis of a concave mirror of focal length 20 cm. At this instant object is given a velocity v towards the axis (event-I) or perpendicular to axis (event-2). Then, speed of image

    A kid of height 1.1 ft is sleeping straight between focus and centre of curvature along the principal axis of a concave mirror of small aperture. His head is towards the mirror and is 0.5 ft from the focus of the mirror. How a plane mirror should be placed so that the image formed by it due to reflected light from concave mirror looks like a person of height 5.5 ft standing vertically. Draw the ray diagram. Find the focal length of the concave mirror.

    A parallel beam of light, parallel to the principal axis of a concave mirror, on reflection meets at the :

    A short object of length L is placed along the principal axis of a concave mirror away from focus. The object distance is u . If the mirror has a focal length f , what will be the length of the image ? You may take L lt lt | u - f | .

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