Exams › NEET › Physics

For the initial minimum, the angle θ is given by nλ/a. Determine sin 30°.

1. λ = 1/2
2. λ = 1/3
3. λ = 1/4
4. λ = 1/5

Correct answer: λ = 1/2

Solution

The first minima condition for diffraction is given by θ = nλ/a. For sin 30° = 1/2, substituting n = 1 (first minima), we get λ = 1/2.

Related NEET Physics questions

• Ray optics is valid when characteristic dimension are
• In Young's experiment with white light, the central fringe is white. If now a transparent film is introduced in the upper beam coming from the top slit, then the white fringe:
• A: Coloured spectrum is seen when we look through a cloth R: Diffraction of light takes place when light is travelling through the pores of cloth
• A microscope is used with sodium light and its resolving power is not sufficiently large.Higher resolution will be obtained by using wavelength of
• Assertion Assertion: When a light wave travels from a rarer to a denser medium, its speed decreases. The decrease in speed imply a reduction in energy carried by the light wave. Reason Reason: The energy of a wave is inversely proportional to velocity of wave
• When light travels from one medium into another it suffers

⚔️ Practice NEET Physics free + battle 1v1 →