Question

Classify the objects or minerals
given below as opaque, transpar-
ent or translucent and luminous
and non-luminous : Air, water, a
piece of rock, a sheet of alu-
minium, a mirror, a wooden
board, a sheet of polythene, a CD,
smoke, a sheet of plane glass, fog,
a piece of red hot iron, an um-
brella, a lighted fluorescent tube,
a wall, a sheet of carbon paper,
the flame of a gas burner, a sheet
of cardboard, a lighted torch, a
sheet of cellophane, a wire mesh,
kerosene stove, Sun, firefly, moon​

Answer 1

Explanation:

As per the provided information in the given question, we have to classify the objects as opaque, transparent, translucent and luminous & non-luminous.

⇒ Opaque Objects :

• A piece of rock
• A sheet of aluminum
• A mirror
• A wooden board
• A CD
• A sheet of plane glass
• A piece of red hot iron
• An umbrella
• A lighted fluorescent tube
• A wall
• A sheet of carbon paper
• The flame of gas burner
• A sheet of cardboard
• A lighted torch
• A wire mesh
• Kerosene stove
• Sun
• Firefly
• Moon

⇒ Transparent Objects :

• Air
• Water
• A sheet of cellophane

⇒ Translucent Objects :

• A sheet of polythene
• Smoke
• Fog

$\rule{200}2$

⇒ Luminous Objects :

• A lighted fluorescent tube
• A lighted torch
• Kerosene stove
• Sun
• Firefly

⇒ Non-luminous Objects :

• A piece of rock
• A sheet of aluminum
• A mirror
• A wooden board
• A CD
• A sheet of plane glass
• A piece of red hot iron
• An umbrella
• A wall
• A sheet of carbon paper
• The flame of gas burner
• A sheet of cardboard
• A wire mesh
• Moon
• Air
• Water
• A sheet of cellophane
• A sheet of polythene
• Smoke
• Fog

________________________

$\longmapsto$ Opaque objects : The objects which don't allow light to completely páss through them are called opaque objects.

$\longmapsto$ Transparent objects : Objects which allow light to completely páss through them are called transparent objects.

$\longmapsto$ Translucent objects : Objects which allow light to partially pàss through them are called translucent objects.

$\longmapsto$ Luminous objects : Objects which emit their own light are called luminous objects.

$\longmapsto$ Non-luminous objects : Objects which don't have their own light are called non-luminous objects.