1.Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?
ANS: Regular reflection takes place from a smooth or a regular surface. In regular reflection, all reflected rays are parallel to each other for parallel incident rays. Irregular or diffused reflection takes place from an irregular surface. In diffused reflection, the reflected rays are not parallel to each other for parallel incident rays.
2.State the laws of reflection.
Ans:(i) The angle of reflection is always equal to the angle of iincidence.
ANS: Regular reflection takes place from a smooth or a regular surface. In regular reflection, all reflected rays are parallel to each other for parallel incident rays. Irregular or diffused reflection takes place from an irregular surface. In diffused reflection, the reflected rays are not parallel to each other for parallel incident rays.
2.State the laws of reflection.
Ans:(i) The angle of reflection is always equal to the angle of iincidence.
(ii) The incident ray, the reflected ray and the normal to the reflective surface at the point of incidence all lie in the same plane.
3.Draw a labelled sketch of the human eye.
4.Why Laser light is harmful for the human eyes
Ans: Laser light is harmful for the human eyes, because its intensity is very high. It can cause damage to the retina and lead to blindness. Hence, it is advisable not to look at a laser beam directly.
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