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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