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Science CBSE Homework Assignments
Class 10
The human eye and colourful world
Power of lens
2.
Power of convex lens
Task:
4
m.
1
.
Which of the following is the power of convex lens having focal length \(20\ cm\)?
\(4\ D\)
\(6\ D\)
\(20\ D\)
\(5\ D\)
2
.
The stars appear twinkling on a clear night due to:
(a) Reflection of light
(b) Refraction of light
(c) Scattering of light
(d0 Both a and b
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