Refraction of Light at Plane Surfaces | Numericals on Refraction of Light | @sirtarunrupani

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Refraction of Light at Plane Surfaces | Numericals on Refraction of Light ICSE class 10 | ‪@sirtarunrupani‬

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Light
(i) Refraction of light through a glass block and a
triangular prism - qualitative treatment of
simple applications such as real and apparent
depth of objects in water and apparent bending
of sticks in water. Applications of refraction
of light.
Partial reflection and refraction due to
change in medium. Laws of refraction; the
effect on speed (V), wavelength (λ) and
frequency (f) due to refraction of light;
conditions for a light ray to pass undeviated.
Values of speed of light (c) in vacuum, air,
water and glass; refractive index µ = c/V, V =
fλ. Values of µ for common substances such
as water, glass and diamond; experimental
verification; refraction through glass block;
lateral displacement; multiple images in thick
glass plate/mirror; refraction through a glass
prism, simple applications: real and apparent
depth of objects in water; apparent bending of
a stick under water. (Simple numerical
problems and approximate ray diagrams
required).
(ii) Total internal reflection: Critical angle;
examples in triangular glass prisms;
comparison with reflection from a plane
mirror (qualitative only). Applications of total
internal reflection.
Transmission of light from a denser medium
(glass/water) to a rarer medium (air) at
different angles of incidence; critical angle
(C) µ = 1/sin C. Essential conditions for total
internal reflection. Total internal reflection in
a triangular glass prism; ray diagram,
different cases - angles of prism (60º,60º,60º),
(60º,30º,90º), (45º,45º,90º); use of right angle
prism to obtain δ = 90º and 180º (ray
diagram); comparison of total internal
reflection from a prism and reflection from a plane mirror

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