What is the main difference
between a refracting telescope and a reflecting telescope
The main difference between
refracting and reflecting telescope ; in refracting telescope , the process of
refraction is uses, lenses are employed to bend ray of light to form
images wile in reflecting telescopes the
curved mirrors are used to bend ray of light to form images.
why do optical telescopes
produce a sharper image
Answer this question
why do optical telescopes
work better in space
In space, however, telescopes
are able to get a clearer shot of everything from exploding stars to other
galaxies. Another disadvantage for ground-based telescopes is that the earth's
atmosphere absorbs much of the infrared and ultraviolet light that passes
through it. Space.com
what is it called when you
combine the images from more than one telescope
It is called
interferometry and the device used is
called interferometer
what is the wavelength of the
longest wavelength light that can be seen with the human eye?
the longest wavelength of em waves that can be
seen with an unaided human eye is 400nm, the longest wavelength in the visible
light spectrum. That is the red light.
a ____ is used to produce and
analyze a spectrum
the answer is spectrograph
the amount of energy in a
photon of light is proportional to the __________
Frequency and velocity as
given by e =hf where
e is the em energy , f is the frequency and h is plank constant v is
velocity and λ is wavelength. E α f .
when light rays reflect off a
rough surface they _________
They scatter in several
direction, thought they obey law of reflection individually.
"an image that results
from the apparent path of light rays is called a(n) ________"
a virtual image ,
a virtual image caused by
reflection of light in the atmosphere is called a
a mirage
what is the reflection of
light waves from a smooth surface called
the reflection of light from a smooth surface
is called regular or specula
reflection, it occurs when the degree of roughness in a
reflecting surface is less than the wavelength of light.
an image seen in a smooth
dinner plate is an example of ____ reflection
Is a regular reflection, any
reflection from a smooth surface is a regular reflection.
light waves bend or refract
at the ______between two media
the reflection process takes place the
boundary , when light a light reach a boundary it changes from one medium to
another, because different media have
different refractive index.
give an example where
refraction is abrupt, and another where refraction is gradual
Answer this question
Does the law of reflection
apply to all reflecting surfaces
the law of reflection hold for all reflecting surface, be it a
smooth or rough surface, that this the angle of reflection and incident are equal, and the incident ray,
the reflected ray and the normal at the point of incident all lie on the same
plane. While in smooth surface , it
obvious . In rough surfaces the
individual rays obey the law.
three features of an image
produced in a plane mirror"
the three feature of an image formed by a
plane mirror are same size as the object, virtual and erect.
or in other words, unmagnified,
formed behind the mirror and upright.
"what is the
magnification produced by a plane mirror" the magnification produce by a
plane mirror is a unity and positive.
Meaning the object and the image are same size.
"the law that governs
the force between electric charge is called"
the law is called coulomb law
, it is the fore between charges separated by a distance r, if the charges are like charges the force is
repulsive and attractive if they are
unlike charges.
"if the distance between
two charges is tripled what will happen the force between the charges"
the coulomb force between them will decrease 9
times, according to the coulomb force the
, the attraction or repulsion is inversely proportional to the distance separating them.
"if the distance between
two charges is doubled what happens to the force"
if the distance is doubled the force will
decrease by 4 time, remember it is an inverse square law.
"what happens to the
force between two charges if the distance between them is cut in half
the force decrease four times.
"if the distance between
two charges is quadrupled what will happen the force between the charges"
The distance between the
charges will decrease 16 times, what we need to do is to divide the force by
16. Remember coulomb force is an inverse
square law.
"calculate the force
between a 0.006 c charge and a 0.001 c charge 4 meters apart."
the force is given as f= kq1q2/r2, the force will therefore be
F=(0.006*0.001
*9*109)/42 =3,000 newton
"what is the force
between a 3 c charge and a 2 c charge separated by a distance of 10
meters?"
from coulomb law, the force is given as f= kq1q2/r2, the force will therefore be
F3*2 *9*109)/102 =5.00 *108
newton
If the charge on q1 is
doubled what will happen to the force between the two charges
Answer this question
"if the distance between
two masses is tripled the gravitational force between them is"
The gravitational force will
decrease by 9 ime, remember it is an inverse square law.
"if the distance between
two masses is tripled, the gravitational force between changes by a factor
of"
The gravitational force
chances by a factor of 9. The force decreases 9 times , remember it it is
inverse square law.
the image seen in a plane
mirror is located __________
Behind the mirror
"what is meant by the
normal to a surface physics
the term simply mean at 90° to the plane or
perpendicular to the surface.
"you do not see your
image when you look at a flat rough aluminum surface because of
Diffuse reflection of the
beam coming to your eye, the image is therefore distorted.
"the type of mirror that
will allow you to see large areas normally hidden from your view is
Is convex mirror, this why it
is been used in car driver mirror for a wide rare view and as a security mirror
in a store. the reflecting surface bulge toward the light making it to cover a
large area.
how far behind the mirror is
the image of an object that is located in front of the mirror
for a plane mirror , the object distance and
the image distance are the same, therefore the image is at same distance behind
the mirror as it in front of the mirror.
for a convex mirror no matter the position of
the object the image is always behind the mirror between the focal length and
the vertex of the mirror.
for concave mirror when the object is placed
at the infinity the image is formed at F. when the object is beyond the centre
of curvature, C, the image is between C
and F. when the object is at C, the
image is also at C.
when object is between C and
F, the image is beyond C. When object is at the focus the image is at infinity.
when object is between the pole and the
focus the image is behind the mirror.
note symbols having their usual meaning.
why is the image formed by a
plane mirror is called virtual rather than real?
it is called virtual because the light ray
that formed the image did not actually
come from the object, the rays only appeared to have diverged from the object.
it is the apparent ray tat form such images.
"if a light ray strikes
a flat mirror at an angle of 27° from the normal the reflected ray will be
at 27 degree away from the normal., laws of eflection
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