PHYSICAClass 12 Physics simulations · Ray Optics and Optical Instruments
Compound microscope
An objective makes a magnified real image; the eyepiece magnifies it further.
What to notice
Short focal lengths for both lenses and a longer tube give greater magnification.
Key relation
m = (L/f_o)(1 + D/f_e) or (L/f_o)(D/f_e)
Try this
Halve the objective focal length. Compare the change with halving f_e.
What you can change
- Objective focal length f_o: 0.4 to 2 cm
- Eyepiece focal length f_e: 1.5 to 6 cm
- Tube length L: 10 to 20 cm
- Final image: choose At near point (25 cm), At infinity (relaxed eye)
More in Ray Optics and Optical Instruments
- Real and apparent depth
- Astronomical telescope
- 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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