Convex lens at different object distances

=Activity = To study the nature of images formed by convex lens at different object distances Shared By : Sujatha Padavu Asst.teacher, Adarsha Bharathi High School Padil ,Mangaluru

Estimated Time
10 minutes

Materials/ Resources needed

 * 1) convex lens,
 * 2) lens stand,
 * 3) candle match box,
 * 4) screen,
 * 5) scale.

Prerequisites/Instructions, if any
Carefully observe the nature of images formed.

Website interactives/ links/ simulations
http:s//www.youtube.com/watch?v=HGVUVFcyc6o

Process (How to do the activity)

 * 1) Fix one convex lens on the lens stand facing a distant object and catch its clear image on the screen . Measure the distance between the image and the lens. It is the Focal length and the point is the focal Point F
 * 2) Now place the object between the lens and the focal point and observe the nature of image.
 * 3) Now keep a burning candle between the F and 2F and catch the image on the screen. Now note down the nature of the image.

Developmental Questions (What discussion questions)

 * 1) Do you see the image ?
 * 2) Where do you see the image?
 * 3) Is the image very clear to you?
 * 4) What are the differences you find between the image and the object?
 * 5) Based on the your observation explain the nature of image  in terms of the size . image Distance
 * 6) Whether the image is real or virtual?

Evaluation (Questions for assessment of the child)

 * 1) Write the nature of image formed when the object is at infinity ?
 * 2) When you converge sun rays on a piece of paper why it will burn ?
 * 3) Why do the watch repair workers use convex lens?

Question Corner
List out the uses of convex lens in our daily life?

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