Question

The concave reflecting surface of a torch got rusted. What effect would this have on the beam of light from the torch?

Answer 1

The concave reflecting surface of a torch:

1. Concave lens is used to spread widely the light produced by a small bulb inside a torch.
2. The bulb of the headlight or a torch is placed at the focus of a concave mirror.
3. The light rays, coming from the bulb, emerge as parallel rays after getting reflected in the concave mirror.
4. The reflected rays coming out of the torch can cover large distances with high intensity.
5. If a torch’s concave reflecting surface becomes rusted.
6. It will no longer create a clear beam of light and instead will emit light with lesser brightness, making the object less visible in lower brightness or light.

Thus, rusting will affect badly to the beam of light emitted from the torch as the brightness of the light will decrease.