Multiple Choice Question XXV — task. Science CBSE, Class 10.

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1. What is the focal length of lens having power \(+2\ D\) ?

\(20\ cm\)
\(25\ cm\)
\(50\ cm\)
\(40\ cm\)

2. The muscles of the iris control the:

Focal length of the eye-lens
Amount of light entering the eye
Shape of the cyrstalline lens
Optic nerve

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