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Image Formation by Concave Mirror

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Aim

To determine the focal length of a concave mirror by obtaining the image of a distant object and observing image formation at different object distances.

Materials Required

Concave mirror
Screen
Mirror holder
Scale
Candle/Object

Procedure

  1. Mount the concave mirror on the mirror holder.
  2. Place the object (candle) at different distances (u) in front of the mirror along the principal axis.
  3. Move the screen to find a sharp image of the object.
  4. Record the object distance (u) and image distance (v).
  5. Observe the nature (Real/Virtual) and size (Magnified/Diminished) of the image.
  6. Use the mirror formula: 1/f = 1/v + 1/u to calculate focal length.

Precautions

  • The mirror and screen should be at the same height.
  • The object should be well illuminated.
  • Take all distance measurements from the pole of the mirror.
Object: -40.0 cm   |   Image: -24.0 cm   |   Focal Length (f): -15.0 cm
Nature: Real, Inverted, Diminished

Observation Table

S.No. Object distance u (cm) Image/Screen distance v (cm) Nature of image Size of image

📹 Experiment Video

1. Focal length of a concave mirror is:

2. When object is at C (Centre of Curvature), image is:

3. Concave mirror is used in:

4. When object is between P and F, image is:

5. Mirror formula is:

Lab Report

Aim: To determine the focal length of a concave mirror by obtaining the image of a distant object and observing image formation at different object distances.

Result: By observing images at different object distances, we verified the mirror formula and determined the focal length of the concave mirror.

Recorded Observations

No observations recorded yet. Complete the simulation to generate the report.