PYQ Vault

Day 160: CBSE Class 10 Science

5 questions (8 parts). Try each one first, then open its answer.

  1. Question 1

    Light — Reflection and Refraction. Asked once: 2025 (same type asked 3 times)

    10
    To get an image of magnification −1-1 on a screen using a lens of focal length 20 cm, the object distance must be :

    Tap an option to check your answer.

  2. Question 2

    Light — Reflection and Refraction. Asked once: 2023 (same type asked 3 times)

    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.

  3. Question 3

    Light — Reflection and Refraction. Asked once: 2025 (same type asked 3 times)

    13
    Identify from the following the ray diagram which shows the correct path of the reflected ray for the ray incident on a concave mirror as shown :

    Tap an option to check your answer.

  4. Question 4

    Light — Reflection and Refraction. Asked once: 2026 (same type asked 3 times)

    33
    Use the above given ray diagram to calculate the angle of incidence. Given that the refractive index of Medium 2 with respect to the Medium 1 is 3\sqrt{3}.

  5. Question 5 (case study, 4 parts)

    Light — Reflection and Refraction. Asked once: 2024 (same type asked 3 times)

    Study the data given below showing the focal length of three concave mirrors A, B and C and the respective distances of objects placed in front of the mirrors :
    CaseMirrorFocal Length (cm)Object Distance (cm)
    1A2045
    2B1530
    3C3020
    39 (i)
    In which one of the above cases the mirror will form a diminished image of the object ? Justify your answer.
    39 (ii)
    List two properties of the image formed in case 2.
    39 (iii) (A)
    What is the nature and size of the image formed by mirror C ? Draw ray diagram to justify your answer.
    39 (iii) (B)
    An object is placed at a distance of 18 cm from the pole of a concave mirror of focal length 12 cm. Find the position of the image formed in this case.