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प्रश्न
In biprism experiment, the distance of 20th bright band from the central bright band is 1.2 cm. Without changing the experimental set-up, the distance of 30th bright band from the central bright band will be ______.
विकल्प
0.6 cm
0.8 cm
1.2 cm
1.8 cm
उत्तर
In biprism experiment, the distance of 20th bright band from the central bright band is 1.2 cm. Without changing the experimental set-up, the distance of 30 bright band from the central bright band will be 1.8 cm.
Explanation:
Given:
X20 = 1.2 cm, X30 = ?
For nth bright band `x_n = (Dnlambda)/d`
For 20th bright band `x_20 = 20(Dnlambda)/d` ...(1)
For 30th bright band `x_30 = 30(Dnlambda)/d` ...(2)
Dividing equation (2) by equation (1)
`x_30/x_20 = 30/20`
∴ `x_30 = x_20 xx 3/2`
= `1.2 xx 3/2`
= 1.8 cm
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