Which type of lens has a) a positive power, and b) a negative power?

Which type of lens has negative power ?

Which type of lens has negative power ?

Which lens has positive and which lens has negative power?

Which surface has a positive and which surface has a negative power?

Can power of a lens be negative?

What is meant by power of a lens ? When is it positive or negative? Define one dioptre.

In a Std. X class, out of 40 students, 10 students use spectacles, 2 students have positive power and 8 students have negative power and 8 students have negative power of lenses in their spectacles . Generally which type of spectacles do most of the students use ?

In a Std. X class, out of 40 students, 10 students use spectacles, 2 students have positive power and 8 students have negative power and 8 students have negative power of lenses in their spectacles . What does the positive power indicate ?

In a Std. X class, out of 40 students, 10 students use spectacles, 2 students have positive power and 8 students have negative power and 8 students have negative power of lenses in their spectacles . What does the negative power indicate ?