Assistant General Science

Physics – 05

ലെൻസുകൾ, മിററുകൾ, ഇലക്ട്രോ മാഗ്നെറ്റിക് വേവ്‌സ് , രാമൻ എഫക്ട് എന്നിവയാണ് ഇന്നത്തെ പാഠത്തിൽ ഉൾപ്പെടുത്തിയിരിക്കുന്നത്.

  • Lens using in microscope, telescope etc for magnifying images

Convex lens


  • Lens thicker at center and narrower at edge

Convex lens


  • Lens in human eyes

Convex lens


  • Image formed in convex lens

Real and Inverted


  • Lens narrower at center and thicker at edge

Concave lens


  • Image formed in concave lens

Virtual and erect


  • Camera not using lens

Pinhole Camera


  • Focal length and power of convex lens is always



  • Focal length and power of concave lens is always



  • Power of a lens increases as its focal length



  • Power of a lens is always

Reciprocal of focal length (P=1/f)


  • Dentists and ENT doctors using which type of mirrors

Concave Mirror


  • Type of image formed from Concave mirror

Virtual or real image depends on the position of object


  • The image obtained from a light ray that does not actually come from the point of source is called

Virtual Image


  • Shape of reflector behind a spot lamp or car head light



  • Size of object and image are same in

Plane Mirror


  • Shortest length of a plane mirror required to view the full-size image of person of height L is



  • Persistence of vision in human eye is

1/16 Seconds


  • Ratio of height of the Image to the height of real object is known as



  • Speed of movies

24 frames per Second


  • Phenomenon of appearing right side of a person in mirror image as left side is called

Lateral Inversion


  • Convex lens is also known as

Converging lens


  • Concave lens is also known as

Diverging lens


  • Power of lens is measured in



  • Mirror used in Solar cooker, Car head light

Concave Mirror


  • Mirror used in rear view mirrors in vehicles

Convex Mirror


  • Mirror used in Shaving mirrors

Concave Mirror


  • Short sight and long sight can be corrected together by

Bifocal lens


  • Bifocal lens was invented by

Benjamin Franklin


  • Wave range of electromagnetic waves

103 m to 1012 m


  • Electromagnetic waves are

Radio waves, microwaves, infrared, visible region, UV, S-rays and gamma rays


  • Electro Magnetic wave with maximum wavelength

Radio waves


  • Electro Magnetic waves used for communication through satellites



  • X rays discovered by



  • X rays with higher frequency and more penetrating power

Hard X rays


  • X rays using for radiation and treatment of cancer

Hard X rays


  • X rays using for photography of internal parts

Soft X rays


  • X rays originated from outside of Earth is called as

Cosmic rays


  • Waves using in TV remotes and distant photography



  • Heat of light is due to



  • Waves using for detecting the adulteration of ghee, identification of counterfeit currency

Ultra Violet


  • Waves using to disinfect surgical equipment, and in tube lights

Ultra Violet


  • CV Raman discovered Raman effect in

1928 February 28


  • National Science day

February 28


  • CV Raman got Nobel prize for Physics in



  • Raman effect is associated with

Scattering of light

(To be Continued…)