Login
Home
TOP
Send feedback
Login
Subjects
Physics CBSE Live product
Class 10 (2026-27)
Light reflection and refraction
Image formation by Concave lens
9.
TBQ - Power of the lens
Question:
3
m.
Calculate the correct answer:
Find the focal length of a lens of power
\(-2\ D\).
What type of lens is this?
Power of lens is,
\(P\ =\ \frac{2}{f}\)
\(P\ =\ \frac{1}{f}\)
\(P\ =\ f\)
\(P\ =\ 2f\)
Focal length of a lens
(\(f\)) \(=\)
\(m\)
Type of lens is,
Concave lens
Convex lens
Bifocal lens
Plano convex lens
[Note: Enter your answers with two decimal digit.]
Login
or
Fast registration
Previous task
Exit to the topic
Next topic
Send feedback
Did you find an error?
Send it to us!
