Page 89 - CT&AI_CLasa_7_Part_1

Light: Shadows and

11 Reflections

computational thinking quest

Tick ( ) the correct option.
1. A student looks through a clean glass window (d) reflective, acting like a mirror to
at a tree outside. The image appears clear show the inside of the room.
and undistorted. Which property of glass 3. A teacher places a tracing paper and a glass
explains this? (Abstract Thinking) sheet in front of a torch beam separately.

Students observe the difference. Which
observation is correct? (Pattern recognition)

(a) Both tracing paper and glass sheet
allow equal passage of light.
(b) Glass sheet allows clear passage of
light, tracing paper diffuses it.
(a) It absorbs all light rays.
(c) Tracing paper blocks light
(b) It reflects most of the light rays. completely, while glass sheet

(c) It allows most light to pass through bends it randomly.
without scattering. (d) Neither material allows light to

(d) It bends light randomly. pass.
4. Why do doctors use X-ray imaging instead
2. A person hangs a thin white linen curtain of ordinary torchlight to see bones inside the
over a window. They can see that it is bright body? (Decomposition)
outside, but they cannot see the specific
shapes of the cars parked on the street. This (a) Bones are transparent to X-rays
is because the curtain is (Abstract Thinking) but opaque to visible light.

(a) transparent, allowing all light to (b) Bones are opaque to X-rays,
pass through directly
forming internal shadows on film.
(b) opaque, blocking all light from
entering the room (c) Torchlight produces clearer
(c) translucent, passing some light shadows than X-rays.

through but scattering it in different (d) X-rays bend around bones to form
directions images.

Light: Shadows and Reflections 87