Obtain the image of a candle flame made by a convex lens on a screen. study the nature and size of the image for different distances between the candle flame and the lens
Answers
Answer:
Real and enlarged image is seen
Obtain the image of a candle flame made by a convex lens on a screen. study the nature and size of the image for different distances between the candle flame and the lens
Explanation:
Lens: It is the portion of transparent optical material having one or two spherical faces.
Types of Lens:
• Concave
• Convex
The terminology used for lenses :’
- Optical Centre: It is the centre of lens
- P Axis: It is the line passing straight through optical centre
- Focus: pt. Where refracted rays meet or appear to meet
- Focal length: Distance between focus and optical centre
- 2f: Twice of focal length
- Nature: The rays that fall on convex lens after refraction meet at one point so it is converging lens.
Rules to obtain image from convex lens:
1. Incident Ray coming parallel to p.axis after refraction passes through focus.
2. Incident Ray coming from focus after refraction becomes parallel to p.Axis.
3. Incident ray coming from O goes straight
The images obtain when candle flame and lens has varied distances :
1. Candle flame between O and F
Image formed in front of lens
Image is virtual erect and magnified .
2. Candle flame at F
Image formed at infinity .
Image is real and inverted .
Image is diminished .
3. Candle flame between F and 2F
Image formed beyond 2f
Image is real and inverted and magnified .
4.Candle flame is at 2F
Image formed at 2F
Image formed is real and inverted and of same size .
5.Candle flame is beyond 2F
Image formed between F and 2F
Image is real , inverted and diminished .
6.Candle flame is at infinity
Image is formed at F
Image formed is real ,inverted and highly diminished .
