1. When a light ray travels from one
medium to any another part of it is transmitted and part of it is reflected.
The transmitted ray is refracted.
2. Real images are formed at point where light
ray actually intersect while virtual images formed when light only appear to
intersect.
3. Plane mirrors form virtual images
while lens formed real images, virtual images do not exist.
4. Magnification is the ratio of image
height to object height or ratio of image distance to the object distance.
5. If magnification is negative if the
image is inverted or upside down.
6. Images formed on plane mirrors are
have left and right reversed, inverted, unmagnified and equidistance with object.
7. Your dressing mirror is a 2nd
surface mirror.
8. Spherical mirrors are mirror whose
surface shapes are spherical with radius of curvature r. Concave and convex
mirror are the two types of mirrors. In concave mirror the reflecting surface
bend inward while in convex the reflecting surface is bending outward.
9. Focal point is places where light
from an object appear intersect, for concave it is in front of the mirror while
in convex it is behind the mirror.
10.
Focal
length is the distance between from the surface of a mirror to the focal point;
it is half of the radius of curvature.
11.
Radius
of curvature is the radius the mirror will have if it were a complete sphere.
It is always positive.
12.
The
mirror equation is given by i/f=1/do +1/di, where f is
the focal length, do and di are the object and image
distance respectively.
13.
Apparent
depth is due to the refraction of light
14.
Lenses
are refract light to form image while
mirror reflect light to form image.
15.
The
thin lens equation is same as mirror equation
16.
In
lens incident light rays converge on the
foal length.
17.
The number of images formed by a plane mirror
incident at an angle θ is given by (360/θ)-1 if θ is a multiple of 360 and if
not the number of image is given by (360/θ) because the last two images will
not overlap.
18.
In
concave mirror if the object is between the focal point and the pole , the image formed is behind the
mirror, virtual , erect and larger than the object.
19.
In
concave mirror, if object is at the focal point the image formed at infinity
20.
In
concave mirror is the object is between the focal point and the and centre of
curvature , the image is real, inverted
and larger than the object.
21.
In
concave mirror if the object is at the
centre of curvature , then the image formed is also the centre of curvature,
real, inverted and unmagnified.
22.
In
concave mirror when the object is beyond
the centre of curvature of the mirror the image formed is diminished, inverted,
real and between the focal point and the centre of curvature .
23.
The image is at focal point , real, inverted
and diminished if the object is at
infinity.
24.
In
convex mirror image formed is always erect, virtual, diminished and between the
pole and focal point of the mirror no matter the position of the object.
25.
Refracting telescope uses a combination of
lenses to form images.
26.
Plane
mirrors are used in periscope, kaleidoscope, reflecting galvanometer and as
dressing mirror.
27.
Spherical
convex mirrors are used as car driving
mirrors, dentist mirror, shaving
mirrors, reflecting telescope etc.
28.
Systems
with shorter focal length have greater optical power than a system with longer focal
length.
29.
Longer
focal length is used for photography and telecopy.
30.
Shorter
focal length is needed for microscopy, because substances are brought very
close and very powerful focal power is needed.
31.
Lenses
maintain same focal length as light travel from front to back and from back to
front.
32.
A
flat surface has its radius of curvature close equal to infinity.
33.
Linear
magnification is not always useful for magnifying power in lenses.
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