A single slit of width a is illuminated by a monochromatic light of wavelength 600 nm. The value of ' a ' for which first minimum appears at θ = 30° on the screen will be: (a) 3 (b) 0.6 (c) 1.8 (d) 1.2

Answer: (d). First minimum: asin θ = λ. a = (600 nm)/(sin 30°) = 1200 nm = 1.2. So the answer is (d) 1.2.

A single slit of width a is illuminated by a monochromatic light of… | JEE Main 2023 (15 Apr, Shift 1)

Q43JEE Main 2023 · 15 APR · SHIFT 1Easy

Diffraction at a Single Slit

A single slit of width $a$ is illuminated by a monochromatic light of wavelength $600\text{ nm}$ . The value of ' $a$ ' for which first minimum appears at $\theta = 30^\circ$ on the screen will be:

Show answer and solution

Answer: (d)

First minimum: $a\sin\theta = \lambda$ .
$a = \frac{600\ \text{nm}}{\sin 30^\circ} = 1200\ \text{nm} = 1.2\ \mu\text{m}$ .
So the answer is (d) $1.2\ \mu\text{m}$ .

Report a mistake

More questions on Diffraction at a Single Slit

A beam of light of wavelength 600 nm from a distant source falls on a single slit 1 mm…MHT CET 2023 (11 May, Shift 2)
A parallel beam of monochromatic light falls normally on a single narrow slit. The…MHT CET 2023 (10 May, Shift 2)
Light of wavelength ', λ ' is incident on a slit of width ' d '. The resulting…MHT CET 2023 (9 May, Shift 2)
In a diffraction pattern due to single slit of width ' a ', the first minimum is observed…MHT CET 2023 (9 May, Shift 1)
The diffraction fringes obtained by a single slit are ofMHT CET 2023 (14 May, Shift 1)
In the experiment of diffraction due to a single slit, if the slit width is decreased…MHT CET 2023 (11 May, Shift 1)
Two wavelengths of sodium light 590 nm and 596 nm are used one after another to study…MHT CET 2023 (14 May, Shift 2)
If I₀ is the intensity of the principal maximum in the single slit diffraction pattern…MHT CET 2023 (14 May, Shift 1)

Diffraction at a Single Slit question from JEE Main 2023 (15 Apr, Shift 1)

More questions on Diffraction at a Single Slit