KVPY SB SX Exam 2011 Question Paper

Question : 31 of 120

Marks: +1, -0

In a Young's double slit set-up. light from a laser source falls on a pair of very narrow slits separated by 1.0 micrometer and bright fringes separated by 1.0 millimeter are observed on a distant screen. If the frequency of the laser light is doubled, what will be the separation of the bright fringes?

0.25 mm
0.5 mm
1.0 mm
2.0 mm

Validate

Solution:

Separation
Bright fringe

={\λD}/d

fλ=c

If f is doubled ⇒ λ become halved
∴ β become half

\β=1/2=0.5\mm

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