Geometrical Optics - Questions And Answers - Physics II - For Class X (Science Group)

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Unit 13: Geometrical Optics
Physics II
For Class X (Science Group)
Question & Answers

Q.3: Draw ray diagram for the image formation by a concave mirror. Also state their characteristics?
Ans: IMAGE FORMATION BY CONCAVE MIRROR:
The ray diagram illustrate the formation of images by a concave mirror for various position of the object.
1. Position of object: When Object is Placed at Infinity.
CHARACTERISTICS:

• Position of image: Image is formed at the focus F (Focal Length)
• Size of image: Highly diminished, point sized
• Nature: Real and inverted

Ray Diagram:

2. Position of object: When Object is Placed Beyond C (The Center of Curvature).
CHARACTERISTICS

• Position of image: Image is formed between F and C.
• Size of image: Diminished
• Nature: Real and inverted

Ray Diagram:

3. Position of object: When Object is Placed At C
CHARACTERISTICS

• Position of image: Image is formed at C
• Size of image: Same size
• Nature: Real and inverted

Ray Diagram:

4. Position of object: When Object is Placed between C and F
CHARACTERISTICS:

• Position of image: Image is formed beyond C
• Size of image: Enlarged
• Nature: Real and inverted

Ray Diagram:

5. Position of object: When Object is Placed at F
CHARACTERISTICS:

• Position of image: Image is formed at infinity
• Size of image: Highly enlarged
• Nature: Real and inverted

Ray Diagram:

6. Position of object: When Object is Placed between P (Optical center) and F
CHARACTERISTICS

• Position of image: Image is formed behind the mirror.
• Size of image: Enlarged
• Nature: Virtual and errect.

Ray Diagram:

• MN is a surface of concave mirror.
• C = Center of curvature
• F = Focal length
• P = Optical center
• AB = Object
• A'B' = Image

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Notes By Sir Wasim Ahmad