Light of wavelength $500 n m$ goes through a pinhole of $0.2 m m$ and falls on a wall at a distance of $2 m$ . What is the radius of the central bright spot formed on the wall?

2.37 c m

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1.37 c m

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3.37 c m

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7.37 c m

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Solution

The correct option is C $1.37 c m$
$R = \frac{1.22 λ D}{r}$ $= \frac{1.22 \times 560 \times 2 \times 10^{- 9}}{0.1 \times 10^{- 9}}$
$= 1.37 c m$

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Light of wavelength 500nm goes through a pinhole of 0.2mm and falls on a wall at a distance of 2m. What is the radius of the central bright spot formed on the wall?

The correct option is C 1.37cmR=1.22λDr =1.22×560×2×10−90.1×10−9=1.37cm

Light of wavelength $500 n m$ goes through a pinhole of $0.2 m m$ and falls on a wall at a distance of $2 m$ . What is the radius of the central bright spot formed on the wall?

The correct option is C $1.37 c m$
$R = \frac{1.22 λ D}{r}$ $= \frac{1.22 \times 560 \times 2 \times 10^{- 9}}{0.1 \times 10^{- 9}}$
$= 1.37 c m$