Categories
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

Positive

 

  • Focal length and power of concave lens is always

Negative

 

  • Power of a lens increases as its focal length

Decreases

 

  • 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

Parabolic

 

  • 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

L/2

 

  • 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

Magnification

 

  • 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

Diopter

 

  • 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

Microwave

 

  • X rays discovered by

Rongen

 

  • 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

Infrared

 

  • Heat of light is due to

Infrared

 

  • 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

1930

 

  • Raman effect is associated with

Scattering of light


(To be Continued…)