In newton's ring experiment the diameter of 4th and 12th dark rings are 0.400cm and 0.700 cm respectively.deduce the diameter of 20th dark ring.
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The distance between consecutive rings is :
0.7 - 0.4 = 0.3 cm.
The number of gaps between the 4th and the 12th ring is :
12 - 4 = 8 gaps
0.3/8 = 0.0375
Each gap is 0.0375 cm
The gaps between the 12th and the 20th is :
20 - 12 = 8 gaps
8 × 0.0375 = 0.3
0.3 + 0.7 = 1
The answer :
1 cm
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