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What does the Refraction of Light revision sheet cover?

Refraction, Refractive index, Optical density, Why light bends at all, The relations of this chapter, refractive index from speeds, Snell's law, the same law as a ratio, critical angle for a denser to rarer boundary, critical angle when the second medium is air, What changes and what does not, Using Snell's law.

Is this for Class 10 Maharashtra SSC Science?

Yes, it is written for the Maharashtra SSC Science syllabus.

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Refraction of Light — Class 10 Maharashtra SSC Science revision notes

A 4-page visual revision sheet for Refraction of Light, written for Class 10 Maharashtra SSC Science. Formulas, diagrams and the traps that cost marks, laid out to be read the night before rather than the term before. Free, and it opens inside CapCompass.

Refraction of Light revision notes, page 1 of 4 — A preview of page 1 — all 4 pages open full size in the app.

Refraction of Light in one look

light bending at a boundary because its speed changes, and what happens when it cannot get out

Why light bends at all

refraction is the bending of light as it passes from one transparent medium into another
the cause is the change in the speed of light, which travels slower in a denser medium
the refractive index n of a medium is c/v, the speed in vacuum divided by the speed in that medium
n has no units, being a ratio of two speeds, and it is always greater than 1 for a real medium
optically denser means a higher refractive index, which is not the same as being physically heavier
light entering a denser medium bends towards the normal, and leaving it bends away

The relations of this chapter

refractive index from speeds n = c/v
Snell's law n_1sin i = n_2sin r
the same law as a ratio sin i/sin r = n_2/n_1
critical angle for a denser to rarer boundary sin C = n_2/n_1
critical angle when the second medium is air sin C = 1/n

What changes and what does not

the speed of light changes, which is the whole cause of the bending
the wavelength changes in proportion to the speed
the frequency does not change, since it is set by the source and nothing at the boundary can alter it
so a colour stays the same colour on entering glass, because colour is decided by frequency
a ray travelling along the normal, at an angle of incidence of zero, does not bend at all, though it does slow down
refraction is reversible: a ray retracing its path comes back exactly the way it came
through a glass slab with parallel faces the ray leaves parallel to the incident ray, only shifted sideways: the lateral displacement

Page 1 of 4. The full sheet, all 4 pages, opens free in the app.

What this Refraction of Light sheet covers

Refraction
Refractive index
Optical density
Why light bends at all
The relations of this chapter
refractive index from speeds
Snell's law
the same law as a ratio
critical angle for a denser to rarer boundary
critical angle when the second medium is air
What changes and what does not
Using Snell's law
Total internal reflection
Critical angle
Where refraction is seen
Dispersion
Spectrum
Dispersion, and the rainbow
Which way the ray bends
Symbols in this chapter
Traps that cost marks
Tricks that save time

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