On which surfaces can you see your reflection ?

Use your brain power! in which musical instruments can you see oscillatory motion?

Answer the following questions: Take a large shining metal spoon. Bring the deeper(i.e., concave) surface closer to your face. Can you see your image? Now take the spoon away from your face. What change do you observe in the image? Now repeat the activity by turning the convex surface of the spoon to the front. What changes do you notice in the image?

Complete the analogy : Smooth surface : Regular reflection of light :: Rough surface : ………….

Select the appropriate options and complete the following paragraph : ( incidence, different, reflected, normal,incident, equal,not equal,same,opposite) The rays falling on a surface are called ………. Rays . The point on the surface at which an incident ray falls is called as point of ………. . The rays going away from the surface after reflection are called ............ rays . the direction of these rays is given by certain rules called as laws of reflection . according to laws of reflection , the angle of reflection is ............ to the angle of incidence . the incident ray , the reflected ray and the normal lie in the ........... plane . the incident ray and the reflected ray are on the ........... sides of the normal .

Answer the following : Classify the below surfaces into forming regular reflection of light and irregular reflection of light : ( surface of the mirror , glazed tiles , soles of shoes , surfaces of tyres , floor of the room when polished , surface of an oily pot , surface of a brick , unpainted wall ).

Out of 10J of radiant energy incident on a surface, the energy absorbed by the surface is 2 J and the energy reflected is 7 J. Then, coefficient of transmission of the body is

Fill in the blanks : Moon is not ………. , hence the sunlight falling on the surfaces of the moon is reflected .

The minimum distance between source of sound and reflection surface for the clear hearing of sound is

Choose the correct alternative and write it along with its allotted alphabet: Which of the following is the requirement for regular reflection of sound? A. smooth surface B. Rough surface C. Vacuum D. Transparent rough surface