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JEE Advanced 2012Paper 1

Exam: JEE Advanced
Year: 2012
Paper: Paper 1
Subject: Physics
Chapter: Wave Optics

JEE Advanced 2012 · Paper 1 · Physics · Wave Optics

Young's double slit experiment is carried out by using green, red...

Young's double slit experiment is carried out by using green, red and blue light, one color at a time. The fringe widths recorded are

\beta_{G}, \beta_{R}

and

\beta_{B}

, respectively. Then,

Options

A $\beta_{G}>\beta_{B}>\beta_{R}$
B $\beta_{B}>\beta_{G}>\beta_{R}$
C $\beta_{R}>\beta_{B}>\beta_{G}$
D $\beta_{R}>\beta_{G}>\beta_{B}$

Correct answer

D. $\beta_{R}>\beta_{G}>\beta_{B}$

Step-by-step solution

We know that fringe width,

\beta=\frac{\lambda D}{d}

\because \quad \lambda_{R}>\lambda_{\mathrm{G}}>\lambda_{B} \quad \therefore \beta_{R}>\beta_{G}>\beta_{B}

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