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Image formed by two coaxial lenses separated by a distance

This type of question, asked 4 times: 10 Apr 2023, 12 Apr 2023, 8 Apr 2024, 5 Apr 2026 S2. All 4 questions below, oldest first.

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  1. Question 1

    10 Apr 2023

    116
    A point object, ' OO ' is placed in front of two thin symmetrical coaxial convex lenses L1L_{1} and L2L_{2} with focal length 24 cm24\text{ }cm and 9 cm9\text{ }cm respectively. The distance between two lenses is 10 cm10\text{ }cm and the object is placed 6 cm6\text{ }cm away from lens L1L_{1} as shown in the figure. The distance between the object and the image formed by the system of two lenses is ___ cmcm.

  2. Question 2

    12 Apr 2023

    28
    Two convex lenses of focal length 20 cm20\text{ }cm each are placed coaxially with a separation of 60 cm60\text{ }cm between them. The image of the distant object formed by the combination is at_____ cmcm from the first lens.

  3. Question 3

    8 Apr 2024

    94
    The position of the image formed by the combination of lenses is :

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  4. Question 4

    5 Apr 2026 S2

    16
    An object AB is placed 15 cm on the left of a convex lens P of focal length 10 cm . Another convex lens Q is now placed 15 cm right of lens P . If the focal length of lens Q is 15 cm , the final image is ____\_\_\_\_

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