Physics 5

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

                  Resiprocal 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 do 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

• Persistance of vision in human eye is

                  1/16 Seconds

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

                  Magnificatin

• Speed of movies

                  24 frames per Second

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

                  Lateral Invertion

• 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 electro magnetic waves

                  10³ m to 10¹² m

• Electro magnetic waves are

                  Radio waves, micro waves, infra red, visible region, UV, S-rays and gamma rays

• Electro Magentic wave with maximum wave length

                  Radio waves

• Electro Magentic waves used for communication through satellites

                  Microwave

• X rays discoverd 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 equipments, and in tube lights

                  Ultra Violet

• CV Raman discovered Raman effect in 

                  1928 February 28

• National Science day

                  February 28

• CV Raman got nobe prize for Physics in 

                  1930

• Raman effect is associated with 

                  Scattering of light
                                                                              (To be Continued...)