Rankers Physics

Diffraction: Practice Problem & Solution

For what distance is ray optics a good approximation when the aperture is 4 mm wide and the wavelength is 500 nm :
32 m
64 m
16 m
8 m

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1. The first diffraction minimum due to a single slit diffraction is at θ = 30° for a light of wavelength 5000Å. The width of the slit is :
2. A beam of light of wavelength \(\lambda = 500 \text{ nm}\) from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The width of central maxima is
3. Assertion (A): Two persons separated by a \(7\text{ m}\) partition wall in a room of \(10\text{ m}\) high can heard each other easily but cannot see each other. Reason (R): Any sound wave can bend by the obstacle while light can't.  
4. Assertion (A): Light is diffracted around the edges of obstacles and it bend such a way which is not easily observed. Reason (R): The wavelength of light is very small.  
5. Assertion (A): In everyday life, we do not encounter diffraction of light in contrast to that for sound. Reason (R): Diffraction characteristic is not exhibited by all kind of waves.