In which of the following light is responsible for the brightness of our atmosphere?
diffraction
refraction
scattering
reflecting
In a cancave mirror object is beyond c then the image formed is at
F
Beyond C
At C
Between F and C
__________ occurs when the tip of the umbra falls on the earth.
partial solar eclipse
partial lunar eclipse
annular solar eclipse
none of these
The distance between the pole and the principal focus is called,
Radius of curvature
Principle axis
Aperture
Focal length
A single narrow streak of light is called
ray
beam
source
images
Bioluminescence is caused because of
a chemical reaction
bacteria
algae
a physical reaction
An object in nature that has or emits light of its own is called
Luminous object
Non-luminous objects
Transparent objects
Translucent object
A shadow is formed when the path of light gets obstructed by an/a:
Opaque body
Transparent body
Translucent body
None of these
An observer in the umbra experiences a:
Partial solar eclipse
Total solar eclipse
Partial lunar eclipse
A pinhole camera is based on the principle of:
Scattering of light
Refraction of light
Rectilinear propogation of light
