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Wave Optics

JEE Main level, numerical answer, medium

95 of 191

Question 95 of 191

In a Young's double slit experiment $15$ fringes are observed on a small portion of the screen when light of wavelength $500nm$ is used. Ten fringes are observed on the same section of the screen when another light source of wavelength $\lambda$ is used. Then the value of $\lambda$ is (in $nm$ ) __________.

Show answer and solution

Answer: 750

15\times 500\times \dfrac{D}{d}=10\times {\lambda }_{2}\times \dfrac{D}{d}

{\lambda }_{2}=15\times 50nm

{\lambda }_{2}=750nm

JEE Main question paper PDF

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JEE Main 2025 Apr 2 Shift 1 question paper

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JEE Main Physics practice question on Wave Optics (Youngs Double Slit Experiment), with the answer and a step-by-step solution. Scan a question from your own book or paper to get a whiteboard video.