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A bichromatic light having wavelength ga...

A bichromatic light having wavelength `gamma_1` and `gamma_2` falls normally on a single slit and produces a diffraction pattern. It is found that the first diffraction minimum for `gamma_1` is at `30^(@)` and second diffraction minimum for `gamma_2` is at `45^(@)` from the central maximum. If `gamma_1` is `5000xx10^(-8)` cm, then the value of `gamma_2` is close to:

A

`3536 xx 10^(-8) cm`

B

`7071 xx 10^(-8) cm`

C

`2887 xx 10^(-8) cm`

D

`3660 xx 10^(-8) cm`

Text Solution

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The correct Answer is:
To solve the problem, we need to use the conditions for diffraction minima in a single-slit diffraction pattern. The positions of the minima are determined by the formula: \[ A \sin \theta = n \lambda \] where: - \( A \) is the slit width, - \( \theta \) is the angle of the minimum, - \( n \) is the order of the minimum (1 for the first minimum, 2 for the second minimum), - \( \lambda \) is the wavelength of the light. ### Step-by-Step Solution: 1. **Identify the given data:** - Wavelength \( \lambda_1 = 5000 \times 10^{-8} \) cm - Angle for the first minimum of \( \lambda_1 \) is \( \theta_1 = 30^\circ \) - Angle for the second minimum of \( \lambda_2 \) is \( \theta_2 = 45^\circ \) 2. **Write the equations for the minima:** - For the first minimum of \( \lambda_1 \): \[ A \sin(30^\circ) = 1 \cdot \lambda_1 \] - For the second minimum of \( \lambda_2 \): \[ A \sin(45^\circ) = 2 \cdot \lambda_2 \] 3. **Calculate the sine values:** - \( \sin(30^\circ) = \frac{1}{2} \) - \( \sin(45^\circ) = \frac{1}{\sqrt{2}} \) 4. **Substitute the sine values into the equations:** - From the first equation: \[ A \cdot \frac{1}{2} = \lambda_1 \quad \Rightarrow \quad A = 2\lambda_1 \] - From the second equation: \[ A \cdot \frac{1}{\sqrt{2}} = 2 \lambda_2 \] 5. **Substitute \( A \) from the first equation into the second equation:** \[ 2\lambda_1 \cdot \frac{1}{\sqrt{2}} = 2\lambda_2 \] 6. **Simplify the equation:** \[ \lambda_1 \cdot \frac{1}{\sqrt{2}} = \lambda_2 \] 7. **Substitute the value of \( \lambda_1 \):** \[ \lambda_2 = \frac{5000 \times 10^{-8}}{\sqrt{2}} \] 8. **Calculate \( \lambda_2 \):** \[ \lambda_2 \approx \frac{5000 \times 10^{-8}}{1.414} \approx 3536 \times 10^{-8} \text{ cm} \] ### Final Answer: The value of \( \lambda_2 \) is approximately \( 3536 \times 10^{-8} \) cm.

To solve the problem, we need to use the conditions for diffraction minima in a single-slit diffraction pattern. The positions of the minima are determined by the formula: \[ A \sin \theta = n \lambda \] where: - \( A \) is the slit width, - \( \theta \) is the angle of the minimum, - \( n \) is the order of the minimum (1 for the first minimum, 2 for the second minimum), ...
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