Page 128 - Innovator's Science-8

10 Light : Mirrors and Lenses

Intended Learning Outcomes

Sphenical Mirrors Reflec on on Light
Laws of Reflec on Lenses

Stepping Stones

1. Have you ever no ced how your face looks larger in a shaving mirror but
smaller in a car's side mirror?
2. Why does a spoon some mes show your reflec on upside down and
some mes straight?
3. Why does a magnifying glass make objects appear bigger when you look
through it?

During the summer holidays, a science museum hosted an exhibition filled
with fascinating displays on nature, space, and technology. One section
showcased a range of mirrors and lenses that instantly drew everyone's
attention. When visitors looked into them, their reflections appeared

completely different from what they usually saw in an ordinary mirror.
Some faces looked unusually large, others appeared tiny, and a few even
seemed to be upside down!

Curious students gathered around, trying to figure out why the same
person could look so different in each mirror. The guide explained that not
all mirrors are flat - some have curved surfaces that bend light differently.

These curved mirrors are called spherical mirrors , and they can form a
variety of images depending on how they are shaped and where the object

Hollow glass sphere is placed.
Hollow glass sphere
SPHERICAL MIRRORS

Mirrors that have a curved surface are
F C
C F known as spherical mirrors. They are called
so as they are a part of a complete sphere. In
a concave mirror, the reflecting surface of
the mirror is on the inner side of the sphere.
Radius of curvature Radius of curvature
Concave mirror Convex mirror In a convex mirror, the reflecting surface of
Types of spherical mirrors the mirror is on the outer side.
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