- 2015 JEE Mains Paper 1: Q.14.
In a double slit experiment, the distance between the slits is d and wavelength of light used is . If the angular separation between the first minima on either side of the central maximum is , the value of d is:
Answer:
d = 2 * lambda * L / a
Explanation:
The angular separation between the first minima on either side of the central maximum is given by:
sin theta = lambda / a
where,
- lambda is the wavelength of light used
- a is the distance between the slits
- theta is the angular separation between the first minima on either side of the central maximum
Substituting the given values, we get:
sin theta = 1 / 2 * 3.0 * 10^-7 * 2.0 * 10^-2 / 2 * 10^-5 = 1.5 * 10^-3
Therefore, the distance between the slit
