PHYSICS

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Across
  1. 2. objects that allow only some light to pass through them
  2. 3. an example for non luminous object is
  3. 5. the phenomenon by which the incident light falling on a surface is sent back into the same medium is known as_______
  4. 6. An image formed on a screen
Down
  1. 1. focal length of plane mirror is
  2. 4. When light is incident on a polished surface __________ reflection takes place