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Length of the image of a rod lying along the principal axis of a mirror

This type of question, asked 2 times: 1 Feb 2023, 4 Apr 2026 S1. All 2 questions below, oldest first.

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  1. Question 1

    1 Feb 2023

    27
    A thin cylindrical rod of length 10 cm10\text{ }cm is placed horizontally on the principle axis of a concave mirror of focal length 20 cm20\text{ }cm. The rod is placed in a such a way that mid point of the rod is at 40 cm40\text{ }cm from the pole of mirror. The length of the image formed by the mirror will be x3 cm\frac{x}{3}\text{ }cm. The value of xx is___

  2. Question 2

    4 Apr 2026 S1

    14
    A rod of length 10 cm lies along the principle axis of a concave mirror of focal length 10 cm as shown in figure. The length of the image is ____\_\_\_\_ cm.

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