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(i) Rohit claims to have obtained an ima...

(i) Rohit claims to have obtained an image twice the size of the object with a concave lens. Is he correct? Give reason for your answer.
(ii) Where should an object be placed in case of a convex lens to form an image of same size as of the object? Show with the help of ray diagram, the position and nature of image formed?
(iii) With the help of ray diagram, illustrate the change in position, size and nature of image formed if convex lens in case of (ii) is replaced by a concave lens of same focal length.

Text Solution

Verified by Experts

(i) Rohit's claim is not correct. This is because image formed by a concave lens is always smaller in size than the object.
(ii) To form an image of size as the object, the object has to be placed at a distance `=2f` from the lens. The course of rays is as shown in Fig.

(iii) In (ii) above, when a convex lens is replaced by a concave lens of same focal length, image formed is smaller in size than the object as
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(i) Rohit claims to have obtained an image twice the size of object with a concave lens. Is he correct? Give reason for your answer. (ii) Where should an object be placed in case of a convex lens to form an image of same size as of the object? Show with the help of ray diagram the position and the nature of the image formed. (iii) With teh help of ray diagram, illustrate the change in position, nature and size of the image formed if the convex lens in case of (ii) is replaced by concave lens of same focal length.

Where should an object be placed in front of a convex lens to get a real image of the size of the object ?

Knowledge Check

  • Where should an object be placed in front of a convex lens to get a real image of the size of the object ?

    A
    At the principal focus of the lens
    B
    At twice the focal length
    C
    At infinity
    D
    Between the optical centre of the lens and its principal focus.

  • An object is placed …………. Of a convex lens to get a real image with the size of the object.

    A
    beyond 2`F_(1)`
    B
    at `2F_(1)`
    C
    at`F_(1)`
    D
    between`F_(1) and 2F_(1)`

  • Where should the object be kept in front of a concave lens to obtain enlarged image?

    A
    Between infinity and 2F
    B
    Between 2F and F
    C
    Between Fand optical centre
    D
    None of the these

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    An object is placed before a convex lens. The image formed

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    When a convex lens forms an image whose size is equal to that of the object , the object is placed

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