In a classroom, four friends found out the focal length of a lens by c

1.	In a classroom, four friends found out the focal length of a lens by conducting an experiment. The value came out to be 12.1cm, 12.2cm, 12.05 cm, 12.3 cm. The friends discussed the reasons for the differences or defects. Mention those reasons.
Answer» Students got different focal lengths. 1. By observing the values they got all positive values. This indicates they are given by convex lens. 2. All the students got exact interger but different decimal value. Reasons : The difference in values is due to least count errors, parallax errors, random errors and systematic errors, etc.

In a classroom, four friends found out the focal length of a lens by conducting an experiment. The value came out to be 12.1cm, 12.2cm, 12.05 cm, 12.3 cm. The friends discussed the reasons for the differences or defects. Mention those reasons.

Answer»

Students got different focal lengths.

1. By observing the values they got all positive values. This indicates they are given by convex lens.

2. All the students got exact interger but different decimal value.

Reasons :

The difference in values is due to least count errors, parallax errors, random errors and systematic errors, etc.