In which of the following light is responsible for the brightness of our atmosphere?
diffraction
refraction
scattering
reflecting
The measurement of brightness of a source of a light is called its
luminous intensity
luminous flux
luminous emittance
non luminous intensity
The darkest part of the shadow is:
Penumbra
Antumbra
Umbra
None of these
In a cancave mirror object is beyond c then the image formed is at
F
Beyond C
At C
Between F and C
Rays coming out from a burning candle or a bulb constitute
a convergent beam of light
a parallel beam of light
a divergent beam of light
perpendicular beam of light
A shadow is formed when the path of light gets obstructed by an/a:
Opaque body
Transparent body
Translucent body
Which mirror is used in staircase of double-decker buses?
Convex mirror
Concave mirror
Plane mirror
Cylindrical mirror
In a concave mirror the object is placed between the focus and the pole, the nature of the image formed is
Real, inverted and enlarged
Real, inverted and dimnished
Real, inverted and same size as the object
Virtual, erect and enlarged.
Concave mirror act as
Converging mirror
Bioluminescence is caused because of
a chemical reaction
bacteria
algae
a physical reaction
