Can A Convex Lens Burn A Paper Using Sunlight | Physics Facts | Doubtnut | Sachin Sir

Convex lens is used to correct :

A convex lens is used as a simple microscope . True/False

The convex lens is used in-

State the type of lens that can be used to burn paper in sunlight at noon.

Annu 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 a diagram, why the other paper did not burn.

Intext Question. Take two convex lenses of different sizes. Collect sunlight on a paper using one of the lenses. The paper will start burning after a while. Note the time required for the paper to start burning. Repeat the process for the second lens. Is the time required the same in both cases? What can you tell from this?

A man is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of focal length 10 cm . The diameter of the sun is 1.39 xx 10^(9) m and the diameter of the sun's image on the paper is