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Physics CBSE Live product
Class 10
Light reflection and refraction
Numericals on mirror and lens
10.
TBQ - Numerical on Power of concave lens
Question:
3
m.
Find the focal length of a lens of power \(-2.0\ D\). What type of lens is this?
Power of lens
is,
\(P\ =\ \frac{1}{f}\)
\(P\ =\ 2f\)
\(P\ =\ f\)
\(P\ =\ \frac{2}{f}\)
Focal length of a lens
(\(f\)) \(=\)
\(m\)
Type of lens
is,
Convex lens
Concave lens
Important!
Note: Enter your answers with one decimal digit.
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