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Grade: 

                        
Doubt of Ray Optics..... Q.G2 and G3......... Thank you Answer is B for G2 and A for G3
2 years ago

Answers : (1)

Arun
24738 Points 
							
Dear student
 
u is refractive index
 
R = 2 f = r / u – 1
 
56 = r / u – 1
 
when curved surface is silvered
 
R = 2 * 10 = 20 = r / u
 
Now
 
56 / 20 = u / u – 1
 
1 – 1/u = 20/56 = 5/14
 
9/14 = 1/u
 
u = 14 / 9 = 1.555
 
Regards
Arun
2 years ago
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