The Eye, Microscopes and Telescopes

Name: The Eye, Microscopes and Telescopes
Author: StemPy Lab

Why do some people need spectacles, and how does a telescope bring the Moon closer? The eye and its defects, the simple and compound microscope, and the refracting and reflecting telescopes, with magnifying power and the limit of what an instrument can resolve. It covers the unit of the Indian syllabus (NCERT, NEET, JEE Main) and the matching topic of A-Level, IB and AP.

3 lessons, about 2 h 30 min6 simulations10 problems11 practice questionsPython in every lesson

Created by StemPy Lab

Course outline (3 lessons)

Lesson 1about 50 min
The human eye and its defects
The eye is a lens system that forms a real, inverted image on the retina. It changes its focal length to see near and far, between the near point $25\ \text{cm}$ and infinity. Short sight needs a concave lens $P = -\dfrac{1}{d_f}$ , and long sight a convex lens $P = \dfrac{1}{0.25\ \text{m}} - \dfrac{1}{d_n}$ .
2 simulations3 practice questions1 Python program3 problems1 Python lab
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Lesson 2about 50 min
Simple and compound microscopes
A simple microscope is one convex lens with the object inside its focus: $m = 1 + \dfrac{D}{f}$ for the image at the near point and $\dfrac{D}{f}$ at infinity. A compound microscope has an objective and an eyepiece, and $M = m_om_e = \dfrac{L}{f_o}\cdot\dfrac{D}{f_e}$ for the final image at infinity.
2 simulations4 practice questions1 Python program4 problems
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Lesson 3about 50 min
Telescopes and resolving power
An astronomical telescope in normal adjustment has $m = -\dfrac{f_o}{f_e}$ and a length $f_o + f_e$ . A large aperture $D$ gathers more light and resolves finer detail, $\theta = \dfrac{1.22\,\lambda}{D}$ . Large telescopes are reflectors, which have no colour error and can be very large.
2 simulations4 practice questions1 Python program3 problems1 Python lab1 question set1 note
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The Eye, Microscopes and Telescopes

Course outline (3 lessons)

The human eye and its defects

Simple and compound microscopes

Telescopes and resolving power

Test Your Learning

Your teacher

Discussion (0)