POST CLASS NOTES

Light – Reflection and Refraction

Topics

1. Reflection of Light

∠ ∠

∠ ∠

2.Spherical Mirrors

FC CF

PFC

ir

P CF

ir

PFC

ir

P CF

ir

PFC P CF

PFC

ir P CF

ir

3. Image Formation by Spherical Mirrors

PFC PFC

PFC PFC

PFC FC P

P CF P CF

4. Mirror Formula

→

→

→

m =h′

h= −

v

u

→

→

PB’X‘ XP

M

N

A’

1

v+1

u=1

f

5. Refraction

Normal Incident ray

Refracted

ray

i

r

𝑠𝑖𝑛 𝑖

𝑠𝑖𝑛 𝑟= 𝑐𝑜𝑛𝑠𝑡𝑎𝑛𝑡

𝑛𝑚 =𝑐

𝑣𝑚𝑛21 =

𝑣1𝑣2

6. Lenses

C1 F1 F2 C2O C1 F1 F2 C2O

C1 F1 F2 C2 C1 F1 F2 C2

C1 F1 F2 C2 C1 F1 F2 C2

O O

OO

7. Image Formation by Lenses

C1 F1 F2 C2O

C1 F1F2 C2O

C1 F1F2 C2O

C1 F1 F2

C2O

C1 F1F2 C2O C1 F1

F2 C2O

8. Lens Formula and Magnification

9. Power of a Lens

P = P1 + P2 + P3 + ...

P =1

Focal length in metres , f

1

f

1u

1v

- =hi v

ho

=u

m =

1

𝑣+1

𝑢=1

𝑓

𝑚 =ℎ′

ℎ= −

𝑣

𝑢

sin 𝑖

sin 𝑟= 𝑐𝑜𝑛𝑠𝑡𝑎𝑛𝑡

𝑛𝑚 =𝑐

𝑣𝑚

𝑛21 =𝑣1𝑣2

1

𝑣−1

𝑢=1

𝑓

𝑚 =ℎ′

ℎ=𝑣

𝑢

𝑃 =1

𝑓

Important Formulae

∠i = ∠r

𝟏

𝒗+𝟏

𝒖=𝟏

𝒇

𝒎 =𝒉′

𝒉= −

𝒗

𝒖

𝐬𝐢𝐧 𝒊

𝐬𝐢𝐧 𝒓= 𝒄

𝒏𝒎 =𝒄

𝒗𝒎

𝒏𝟐𝟏 =𝒗𝟏𝒗𝟐

𝟏

𝒗−𝟏

𝒖=𝟏

𝒇

𝒎 =𝒉′

𝒉=𝒗

𝒖

𝑷 =𝟏

𝒇

Mind Map