Physics•Medium

Wave Optics Puzzle

Physics challenge: In Young's double-slit experiment, light passing through two slits creates interference fringes.

Scenario

Laser light (λ = 600 nm) passes through two slits separated by d = 0.2 mm. The screen is 2 m away. Find fringe positions.

Question 1

What is the fringe spacing (Δy) on the screen?

Question 2

Where is the 2nd bright fringe (m = 2) from the central maximum?

Question 3

If the slit separation d is doubled (to 0.4 mm), what happens to the fringe spacing?

It doublesIt halvesIt stays the sameIt quadruples

Question 4

What is the condition for DESTRUCTIVE interference in Young's experiment?

Path difference = mλPath difference = (m + ½)λPhase difference = 2πmPath difference = 2mλ

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