Lenses, Prisms and Dispersion

Name: Lenses, Prisms and Dispersion
Author: StemPy Lab

How does a magnifying glass make a small thing big, and why does a prism split white light? The lens maker's formula and the thin lens formula, power and combinations of lenses, and the prism with minimum deviation and dispersion, with the rainbow and the colours of the sky. 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 35 min5 simulations10 problems9 practice questionsPython in every lesson

Created by StemPy Lab

Course outline (3 lessons)

Lesson 1about 55 min
Thin lenses and the lens maker's formula
A thin lens bends light by refraction at its two curved faces. A convex lens brings parallel light to a focus. The thin lens formula is $\dfrac{1}{v} - \dfrac{1}{u} = \dfrac{1}{f}$ , and the lens maker's formula gives $f$ from the glass and the two radii.
2 simulations3 practice questions1 Python program4 problems
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Lesson 2about 45 min
Power and combinations of lenses
The power of a lens is $P = \dfrac{1}{f}$ , with $f$ in metre, and its unit is the dioptre. Lenses in contact add their powers. Two lenses a distance $d$ apart have $P = P_1 + P_2 - dP_1P_2$ .
1 simulation3 practice questions1 Python program3 problems1 Python lab
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Lesson 3about 55 min
The prism, dispersion and the colours of the sky
A prism deviates light by $\delta = i + e - A$ . At minimum deviation, $n = \dfrac{\sin\frac{A + \delta_m}{2}}{\sin\frac{A}{2}}$ . The refractive index depends on colour, so a prism spreads white light into a spectrum, and raindrops and the air do the same in the sky.
2 simulations3 practice questions1 Python program3 problems1 Python lab1 question set1 note
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Lenses, Prisms and Dispersion: Timed Test

10 questions · 25 min

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Lenses, Prisms and Dispersion

Course outline (3 lessons)

Thin lenses and the lens maker's formula

Power and combinations of lenses

The prism, dispersion and the colours of the sky

Test Your Learning

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