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Optical Instrument
Compound Microscope - Power of Lenses
Power of Lens:
Power of Objective Lens > Power of Eyepiece
Io acts as the object of eyepiece
Compound Microscope - Position of Object and Images
Position of Object:
Between Fo and 2Fo
Position of Image, Io:
Between Fe and Optical Centre of Eyepiece
Compound Microscope - Nature of Images
Nature of image, Io:
Real, Inverted, Magnefied
Properties of image, Ie:
Virtual, Inverted, Magnefied
Compound Microscope - Distance between the 2 lenses and Magnification
Distance between the 2 lenses:
Greater than fo + fe
fo = focal length of objective lens
fe = focal length of eyepiece
Magnification of Compound Microscope:
Telescope - Power of Lenses
Power of Lens:
Power of Objective Lens < Power of Eyepiece
Io acts as the object of eyepiece
Telescope - Position of Object and Images
Position of Object:
Infinity
Position of Image, Io:
At the principle focus of the objective lens
Telescope - Nature of Images
Nature of image, Io:
Real, Inverted, Diminish (Smaller)
Properties of image, Ie:
Virtual, Inverted, Magnefied, form at infinity
Telescope - Distance between the 2 Lenses and Magnification
Distance between the 2 lenses = fo + fe
fo = focal length of objective lens
fe = focal length of eyepiece
Magnification of Telescope:
Projector - Slide and Projector Lens
Slide:
- As an object
- Is placed tilted at a distance between f and 2f from the projector lens.
Projector Lens:
- Projects an image on the screen that is placed a few meters from the projector lens.
- Can be adjusted to focus a sharp image.
Projector - Condenser and Concave Mirror
Condenser:
- Consists of two Plano-convex lenses.
- Focuses all the light that brightens the whole slide.
- As a heat insulator to stop heat from the bulb so it does not spoil the slide.
Concave mirror:
- Reflects and focuses light that shines on it to the direction of the condenser.
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