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➷ The speed would reduce as glass is denser than air.
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Answer:
Height above the floor from the bottom is 0.82m 
Form the top is 1.71m
Explanation:
See attached file
 
        
             
        
        
        
Answer:
Speed 
Explanation:
Because it depends the speed of the waves
 
        
             
        
        
        
Using the kinematic equation, 
v = u + at
26 = 11 + 3t
15 = 3t
t = 5 seconds. 
Time required is 5 seconds.
        
             
        
        
        
Answer:
(a) 47.08°
(b) 47.50°
Explanation:
Angle of incidence  = 78.9°
<u>For blue light :
</u>
Using Snell's law as:
 
Where,  
Θ₁ is the angle of incidence
Θ₂ is the angle of refraction
n₂ is the refractive index for blue light which is 1.340
n₁ is the refractive index of air which is 1
So,  
 
 
Angle of refraction for blue light = sin⁻¹ 0.7323 = 47.08°.
<u>For red light :
</u>
Using Snell's law as:
 
Where,  
Θ₁ is the angle of incidence
Θ₂ is the angle of refraction
n₂ is the refractive index for red light which is 1.331
n₁ is the refractive index of air which is 1
So,  
 
 
Angle of refraction for red light = sin⁻¹ 0.7373 = 47.50°.