Q15 of 112 Page 310

What type of reflection of light takes place from:

(a) a rough surface?


(b) a smooth surface?

a) Diffused reflection takes place from a rough surface. The reflected rays are not parallel in diffused reflection.


b) Regular reflection takes place from a smooth surface. The reflected rays are parallel in regular reflection.


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13

What is the angle of incidence of a ray of light if the reflected ray is at an angle of 90° to the incident ray?

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Name the apparatus which is used to obtain a thin beam of light.

 16

Which type of reflection of light, regular reflection or diffuse reflection, leads to the formation of images?

 17

What type of reflection of light takes place from:

(a) a cinema screen?


(b) a plane mirror?