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Standard XII
Physics
Question

Two thin films of the same material but different thickness are separated by air. Monochromatic light in incident on the first film. When viewed normally from the point A, the second film appears dark.
From point B, on normal viewing
164611.PNG
  1. the first film will appear dark
  2. the second film will appear bright
  3. the first film will appear bright
  4. the second film will appear dark

A
the first film will appear bright
B
the first film will appear dark
C
the second film will appear bright
D
the second film will appear dark
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Solution
Verified by Toppr

Due to Destructive Interference of light passing from Film 1 and falling on Film 2, The 2nd film will appear dark from both sides.

Answer is D

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164611.PNG
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