Physics
Grade-10
Easy
Question
Which of the following can be used to light up a fire?
- Concave lens
- Convex lens
- Plane mirror
- Convex mirror
Hint:
The convex lens converges the light that catches fire when focused into a paper.
The correct answer is: Convex lens
Convex lens can be used to light up a fire.
- The convex lens is a converging lens.
- It will converge the light rays from all directions and focuses them at a point at the optical center (axis of the lens).
- When the converged light rays are focused to a point on a piece of paper it produces a sharp image and catches fire.
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