Answer:
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Explanation:
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Answer:
At focus
Explanation:
A concave mirror is converging in nature. In a mirror, concave in nature, the rays which are parallel to the principal axis are supposed to be coming from very large distances or we assume the source to be placed at infinity for such rays which are parallel to the principal axis.
These rays, parallel to the principal axis, coming from infinity, converges at the focus of the mirror concave in nature after reflecting from the concave mirror
Answer:
Frequency, 
Explanation:
Given that,
Wavelength of the light,

We need to find the frequency of light. We know that light is an electromagnetic wave. It moves with the speed of light. So,

f is the frequency of light

So, the frequency of light is
. Hence, this is the required solution.