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The image obtained with a convex lens is...

The image obtained with a convex lens is erect and its length is `4` times the length of the object. If the focal length of lens is `20 cm`, calculate the object and image distances.

Text Solution

AI Generated Solution

To solve the problem, we need to find the object distance (U) and image distance (V) for a convex lens given that the image is erect and 4 times the length of the object, with a focal length (f) of 20 cm. ### Step-by-Step Solution: 1. **Understanding Magnification**: The magnification (M) for a lens is given by the formula: \[ M = \frac{h'}{h} = \frac{V}{U} ...
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The image obtained with a convex lens is erect and its length is 4 times the length of the object. If focal length of the lens is 20cm , calculate the object and image distances.

A real image is obtained at 30 cm from a convex lens of focal length 7.5 cm . Find the distance of the object from the lens .

Knowledge Check

  • The distance between the object and its real image from the convex lens is 60 cm and the height of image is two times the height of object . The focal length of the lens is

    A
    `20/3` cm
    B
    20 cm
    C
    `40/3 cm`
    D
    40 cm

  • The focal length of a convex lens is 30cm and the size of the real image is (1)/(4)th of the object. Then the object distance is

    A
    `150cm`
    B
    `90cm`
    C
    `60cm`
    D
    `30cm`

  • The focal length of convex lens is 30 cm and the size of image is quarter of the object, then the object distance is

    A
    150 cm
    B
    60 cm
    C
    30 cm
    D
    40 cm

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    A convex lens and a convex mirror are separated by a distance of 10 cm such that the reflecting surface of the mirror faces the lens. The image of an object placed in front of the convex. Lens at a distance of 20 cm is found to coincide with the object. If the focal length of the convex lens is 15 cm, determine the focal length of the mierror.

    A lens of focal length 12 cm forms an upright image three times the size of a real object. Find the distance in cm between the object and image.

    The same size images are formed by a convex lens when the object is placed at 20cm or at 10cm from the lens. The focal length of convex lens is ____ cm

    A convex lens of focal length f produces an image 1/n times the size of the object. The distance of the object from the lens is

    A convex lens of focal length f produces an image 1//n times the size of the object. The distance of the object from the lens is

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