Question

Parallel rays of sun light meet at a point in the form of a spot of a light on a black paper after

1)What is the distance between the pole of the concave mirror and the paper?

2)What will happen to the paper if the spot of light remains at that point for few minutes ?

3)Give reason for the observation. ​

Please be quick

Answer 1

If the experiment is kept going then the following will happen.

Explanation:

• 2) in the case of the question the parallel rays of sunlight will hit the paper and generate heat.
• The black paper will absorb all the light and little to no amount of light will be reflected
• And there will be conversion of energy from light to heat energy.
• The convex mirror acts as a magnifying glass in this case and the paper might burn if kept for long enough in that position.

To know More

When sunlight is focussed on a sheet of paper through a convex lens , the paper starts burning , while it does not happen case of a concave lens. Can you state why ? https://brainly.in/question/5557841

Answer 2

Given that,

Parallel rays of light of sun reach at a point as a spot of a light on a black paper.

We need to find the distance between the pole of the concave mirror and the paper

Using principle of concave mirror  

The distance between the pape and pole of concave mirror is the focal length of the concave mirror because when the paper is put at focus then the parallel rays of sunlight after obtaining reflected from the concave mirror meet at the focus as a spot

We need to find what happen to the paper if the spot of light remains at that point for few minutes

Using principle of concave mirror

When the spot of light is put on the black paper for a few minutes then the black paper will start burn due to reflection of sunlight from the mirror.

When the all rays of sunlight focus on a spot for few minutes after reflection then the more heat generate and the paper burned.

Hence, This is required answer.