Are these Lenses notes free?

Yes. The full 4-page Lenses sheet is free inside CapCompass, which runs in your browser with no account needed.

What does the Lenses revision sheet cover?

Convex lens, Concave lens, Focal length, The two kinds of lens, The three rays that locate an image, The formulas, and the sign convention, the lens formula, magnification from distances, magnification from sizes, power of a lens, f in metres, lenses in contact, powers add, Sign convention.

Is this for Class 10 Maharashtra SSC Science?

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

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Lenses — Class 10 Maharashtra SSC Science revision notes

A 4-page visual revision sheet for Lenses, 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.

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

Lenses in one look

converging and diverging, one formula for both, and the sign convention that makes it work

The two kinds of lens

a convex lens is thicker in the middle and converges parallel rays to a point
a concave lens is thinner in the middle and diverges them, so they only appear to come from a point
the principal focus F is where parallel rays meet, or seem to meet, after passing through
the focal length f is the distance from the optical centre to that focus
a lens has two foci, one on each side, since light may arrive from either direction
the centre of curvature is at 2F, and it is the point that fixes the special image positions

The three rays that locate an image

a ray arriving parallel to the principal axis leaves through the focus on the far side
a ray passing through the optical centre goes straight on undeviated, which is usually the easiest one to draw
a ray passing through the focus on the near side leaves parallel to the axis
any two of the three are enough to fix the image, and the third is a check
where the rays actually meet, the image is real and can be caught on a screen
where only their backward extensions meet, the image is virtual and cannot be projected

The formulas, and the sign convention

the lens formula 1/v - 1/u = 1/f
magnification from distances m = v/u
magnification from sizes m = h_i/h_o
power of a lens, f in metres P = 1/f
lenses in contact, powers add P = P_1 + P_2

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

What this Lenses sheet covers

Convex lens
Concave lens
Focal length
The two kinds of lens
The three rays that locate an image
The formulas, and the sign convention
the lens formula
magnification from distances
magnification from sizes
power of a lens, f in metres
lenses in contact, powers add
Sign convention
The sign convention, stated once
Images formed by a convex lens
The table's rows as ray diagrams
Locating an image
Reading the answer's signs
Power of a lens
Dioptre
Defects of vision
Power, and lenses in use
Symbols in this chapter
Traps that cost marks
Tricks that save time

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