Physics GK 19 - Light and Human Eye

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1.
Which of the following statements is incorrect about a Plane Mirror?
2.
What is the focal length of a concave lense with number -5D?
3.
Which among the following radiations in the Sunlight causes tanning and sunburn?
4.
In which of the following light produces image focus in front of the retina?
5.
Which among the following kinds of lenses are used to treat Astigmatism?
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