3) Rahul found an concave mirror with label f = 10cm. He want to ignite cotton wool by
concentration sunlight with the mirror.
What must be the distance between mirror and cotton wool to ignite it.
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Answer:
10cm
he should keep the cotton 10cm from the mirror i.e, on the focus of the mirror to ge the maximum ignition.
The sunlight (or a ray from infinity)are concentrated at the focus of a lens.
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