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Solution


Q.

The law of reflection states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection.

Ramesh places a mirror on level ground to determine the height of a pole. He stands at a certain distance so that he can see the top of the pole reflected in the mirror. Ramesh’s eye level is 1.5 m above the ground. The distances from the mirror to Ramesh and from the mirror to the pole are 1.8 m and 6 m, respectively.

Based on the above information, answer the following questions:

 

(ii) What is the height of the pole
1 5 m  
2 4m  
3 3m  
4 2m  

Ans.

(1)

We have,

h1.5=61.8(Since ΔABM~ΔCDM)⇒h1.5=61.8=10.3=10.3⇒h1.5=10.3⇒h15=618⇒h15=13⇒h=153=5 mSo, the height of the pole is 5 m.