Phy Ls 6 Light Flashcards
A concave mirror can form
Both real and virtual image
Focal length is represented by
Focus is represented by
f
F
What are spherical mirrors
Concave mirror and convex mirror together are called as spherical mirrors or curved mirrors
Define focal length and write its formula and unit
The focal length is the distance between the the pole(P) of of a mirror and the focus of the mirror(F)
It is represented by f (small f)
Focal length (f) = radius of the spherical mirror
———————————————– (r/2)
2
According to cartesion sign convention which mirror and which lens has negative focal length
Concave
The mirror which can give An erect and enlarged image and same size inverted image
Concave
Speed of light in vacuum
3 into 10 to the power metre per second
Who was measure the speed of light
Armand Fizeau
If an object is placed at the focus of a concave mirror where is the image formed
Infinity
The velocity of light depends on
The nature of the medium in which it travels
What is the sign for real and virtual image
For real image it is negative and for virtual image is positive
Define optics
The branch of physics that deals with the properties and applications of light
Define light
Light is a form of energy which travels as
Electromagnetic waves.
Laws of reflection
The incident ray the reflected ray and the normal at the point of incidence or lie on the same plane
The angle of incidence is equal to the angle of reflection
Examples for optical instruments
Microscopes in laboratories Cameras Projectors Telescope Binoculars
All distances are measured from the_____of the mirror
Pole
In which side of the mirror is the object always plays
Left
When was the speed of light first measured
In the year 1849
What is the speed of light in vacuum express in terms of kilometres
300 ,000 km per second
What is bioluminescence
And y organisms use that?
The ability of some organisms to make their own light.
They glow ir flash their light to scare off predators in the dark sea habitat
