PHYSICAClass 12 Physics simulations · Ray Optics and Optical Instruments
Astronomical telescope
A long-focus objective collects light from a distant object; a short-focus eyepiece magnifies the angle.
What to notice
Magnification is the ratio of focal lengths; the tube length is their sum.
Key relation
m = f_o / f_e (normal adjustment)
Try this
Find the eyepiece that gives 100× with a 150 cm objective.
What you can change
- Objective focal length f_o: 50 to 200 cm
- Eyepiece focal length f_e: 1 to 10 cm
- Objective diameter: 2 to 30 cm
More in Ray Optics and Optical Instruments
- Real and apparent depth
- Compound microscope
- Image in a concave mirror
- Two thin lenses in contact
- Image through a convex lens
- Lens maker’s formula
- Images in two inclined mirrors
- Guiding light in an optical fibre
- Prism: angle of minimum deviation
- Dispersion through a prism
- Refraction and total internal reflection
- Spherical mirrors: ray diagram
- Total internal reflection
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