Which statement is correct for a zone plate and a lens?

  • A
    Zone plate has multiple foci,whereas a lens has one.
  • B
    Zone plate has one focus,whereas a lens has multiple foci.
  • C
    Both are correct.
  • D
    Zone plate has one focus,whereas a lens has infinite.

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What is the frequency of the light emitted from a sodium lamp?

The radius of the central zone of a circular zone plate is $2.3\,mm$. The wavelength of the incident light is $5893\,\mathring{A}$. The source is at a distance of $6\,m$. What is the distance of the first image in meters?

Choose the incorrect statement.

Light from a sodium lamp is passed through cold sodium vapours. The spectrum of the transmitted light consists of:

Assertion: The colour of the green flower seen through red glass appears to be dark.
Reason: Red glass transmits only red light.

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