Why does obtaining the image of the Sun on a paper with the help of a concave mirror bum the paper?

Give scientific reasons: Why does obtaining the image of the sun on a paper with the help of a concave mirror burn the paper?

Collecting sunlight on a paper with the help of a convex lens bums the paper.

Collecting sunlight on a peper with the help of a convex lens burns the paper.

The size of the image of an object placed at the focus of a concave mirror is ………….. .

A student obtained a clear image of window bars on a screen with the help of a convex lens. But in order to have the best image, his teacher suggested him to obtain the image of a distant tree. Where will the lens has to be moved in order to obtain a clear image?

To obtain an image of the same size as the object with the help of a convex lens,the object should be placed___.

Answer the following questions : Anu and anand have concave and convex lenses respectively . They took lenses in sunlight and tried to burn two pieces of paper of equal areas and temperature . State which lens will burn the paper. Give the reason . Explain with the help of diagram, why the other paper did not burn.

When does a concave mirror form a virtual image ?

Answer the following questions: When an object is moved from the focus to the pole of a concave mirror, What happends to the nature position and the size of the image?

The image formed by a concave mirror is ……….. .