^Magnified image
^Magnified image
- I > O
- v > u
- m > 1
Inequality sign reverses for diminished image
Posts
^Virtual focus
^Virtual focus
- A position on the principal axis where two or more reflected (or refracted) rays appears to meet
- situated infront of mirror
- g. focus of a convex mirror & that of a concave lens (placed in rarer surroundings)
^Real focus
^Real focus
- A position on the principal axis where two or more reflected (or refracted) rays actually meet
- situated infront of mirror
- g. focus of a concave mirror & that of a convex lens (placed in rarer surroundings)
^Virtual image
^Virtual image
- A position where two or more reflected (or refracted) rays appears to meet
- situated behind the mirror & behind the object on same side of lens
- v = + ve for mirrors & – ve for lenses.
- Can’t be obtained on screen, without using a convergent system.
^Real image
^Real image
- A position where two or more reflected (or refracted) rays actually meet
- situated infront of the mirror & behind the lens
- v = -ve for mirrors & +ve for lenses.
- Can be obtained on screen
^Virtual object
^Virtual object
1. A position at which incident rays converge
2. situated behind the mirror i.e. towards the polished side
3. u = + ve for both lenses & mirror
^Real object
^Real object
1. A position from which incident rays diverge
2. situated infront of mirror i.e. towards the reflecting side
3. u = – ve for both lenses & mirror
4. Unless mention assume object to be real, transverse, producing paraxial rays.
^Convex mirror & Concave lens
^Convex mirror & Concave lens
A convex mirror has Inner or depressed side polished. A concave lens is thick near edges & thin near the center. They have following common features
- Virtual focus
- Diverge light rays striking on them
- Negative optical power
- Can form only a diminished & virtual image of a real object.
^Concave mirror & Convex lens
^Concave mirror & Convex lens
A concave mirror has outer or bulged side polished. A convex lens is thick near center & thin near the edges. They have following common features
- Real focus
- Converge light rays striking on them
- Positive optical power
- Can form several type of images such as diminished, enlarged, same size, real virtual image of a real object
- Can’t form a diminished & virtual image of a real object.
^Plane mirror
^Plane mirror
1. Image formed by a plane mirror is virtual, erect, undiminished, unmagnified, behind the mirror such that both the object & image are at equal distances from the mirror.
2. A plane mirror forms real image for a virtual object.
