Refraction Of Light Waves Flashcards
Refraction is the
Bending of light ray as it changes media of different densities
The refraction is responsible for
(i)The bottom clear river appears shallower than it really is
(ii)rod or spoons appear broken when immersed in water
(iii) letters in print seen to be nearer when we place a thick block of glass over them
When light travels from a less dense medium to a more dense medium it and vice-versa?
Bends towards the normal,Bends away from the normal
The incident ray is along the normal The ray
Passes through the block
Laws of refraction
i angle of incidence and refraction are on the same plane
ii)the ration of sin i/sin r
Snells law of refraction is gotten by
A rectangular block
In the abscence of a ray box __ can be used to track emergent rAy
Optical pin
The refractive index is
Real Depth/Apparent depth
Refraction can be explained through
Apparent depth of swimming pool,Apparent bending of stick ,Bringing objects to view
Total internal reflection occurs when
When light travels from dense medium to less dense medium
It can be studied with a
Semicircular glass
Critical angle is the
Angle of incidence in the dense medium when the angle of refraction in the less dense medium is 90
Conditions for T.I. R to occur is
Light must be traveling from dense medium to less medium
Examples internal reflections in Nature
Mirage,Field of view of fish under water
The amount of deviation depends on
(a) the angle of incidence
(B) refracting angle
(C) refractive index
____ are used in high quality periscopes mainly because
Triangular prisms,They dont form multiple images
In a glass prism being passed throughby white light ___ has the greatest speed ___ and has the least speed
Red and Violet
When producing a spectrum its arranged in
Source Slit Coverging lens Prism (60•)converging lens Screen
The colour of an object depends on the
Incident light on it ,also on the absorption and reflection
The primary colours when combined give
White
When a primary colour is mixed with a secondary colour and white is obtained
The colours are called complementary colour
Convex lens are ___ while concave lens are
Converging and diverging
The eye has a
Crystalline biconvex lens
Glass can also be made of
Quartz and plastic