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The law of reflection states that when a ray of light reflects off a surface, theangle of incidence is equal to the angle of reflection.Ramesh placesa mirror on levelground to determine the height of a pole (with traffic light fired on it). He stands at acertain distance so that he can see the top of the pole reflected from the mirror.Ramesh’s eye level is 1.5 m above the ground. The distance of Ramesh and thepole from the mirror are 1.8 m and 6 m respectively.On the basis of the above information, answer any four of the followingquestions:(i) Which criterion of similarity is applicable to similar triangles?(a) SSA(b) ASA(c) SSS(d) AA(ii) What is the height of the pole?(a) 6 metres(b) 8 metres(c) 5 metres(d) 4 metres(iii) If angle of incidence is i , which of the following is correct relation?(a) tan i=5/6(b) tan i= 6/5(c) tan i= 3/5(d) tan i= 5/3(iv) Now Ramesh move behind such that distance between pole and Ramesh is13 meters. He places mirror between him and pole to see the reflection of lightin right position. What is the distance between mirror and Ramesh ?(a) 7 metres(b) 3 metres (c) 5 metres(d) 4 metres(v) What is the distance between mirror and pole?(a) 9 metres(b) 8 metres(c) 12 metres(d) 10 metre

Answer»

Answer:

(i) Which CRITERION of similarity is applicable to similar triangles?

(d) AA

(ii) What is the HEIGHT of the pole?

(c) 5 METRES

(iii) If angle of INCIDENCE is i , which of the following is CORRECT relation?

(a) tan i=5/6



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