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  1. If the focal length of objective lens is increased, then magnifying power of
  2. If the pressure of gas is increased from 1.01×10⁵ Pa to 1.165×10⁵ Pa and volume
  3. An object is seen through a simple microscope of focal length 12 cm.
  4. A dust packet is dropped from 5th storey of a multi-storeyed building
  5. The earth radiates in the infrared region of the spectrum. The spectrum is correctly