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  1. In refraction, light waves are bent on passing from one medium to the second medium
  2. The earth radiates in the infrared region of the spectrum. The spectrum is correctly
  3. The threshold wavelength for photoelectric emission from a material is 4800 Å.
  4. A short linear object of length L lies on the axis of a spherical mirror of focal
  5. A certain number of spherical dropes of a liquid of radius r coalesce to form a single