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Question 20.......plz explain...... The.... Question....... .....

Question 20.......plz explain...... The.... Question....... ..... 

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1 Answers

Mahima Kanawat
1010 Points
5 years ago
Dear student 
Let the point of reflection be O. 
The angle of incidence = angle of reflection
So, angle PSO = angle QS'O
The two triangles PSO and QS'O right angled triangle. These two angles are similar triangles here (Rule of mathematics ) 
Therefore ratio of sides should be same. 
S'Q /SP= OQ /OP
1/4 = OQ /OP
OQ + OP = 12
By solving ratio OP = 9.6 cm and OQ =2.4cm
Answer is B
WITH REGARDS 
MAHIMA 
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