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Interpret the sign and value of magnification

This type of question, asked 3 times: 2023, 2024, 2026. All 5 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    2023

    29
    The magnification produced when an object is placed at a distance of 20 cm from a spherical mirror is +1/2+1/2. Where should the object be placed to reduce the magnification to +1/3+1/3.

  2. Question 2

    2023

    13
    An object is placed in front of a convex mirror at infinity. According to the New Cartesian Sign Convention, the sign of the focal length and the sign of the image distance in this case are respectively :

    Tap an option to check your answer.

  3. Question 3

    2024

    25
    “The linear magnification produced by a spherical mirror is +3+3.” Based on this statement answer the following questions : (a) What is the type of mirror ? (b) Where is the object located ? (c) List two properties of the image formed (other than the size/magnification).

  4. Question 4

    2024

    31 (b)
    (i) The image of an object formed by a mirror is real, inverted and is of magnification-1. If the image is at a distance of 30 cm from the mirror, where is the object placed ? Give reason to justify your answer. (ii) Where would the image be if the object is moved 15 cm towards the mirror ? Draw ray diagram for the new position of the object to justify your answer.

  5. Question 5

    2026

    30
    From the following options choose the one which gives negative magnification greater than one :

    Tap an option to check your answer.