Explore

06. Light

Fill in the Blanks

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Last edited 26 days ago by Learn LoopHQ.

Chapter: 06. Light

⁠

A) Fill in the blanks

Light is a _ _ _ _ _ _ _ _ _ _ _ _ _ _ of energy that causes the sensation of vision.

form

During the night, we can see objects because of light given out by artificial sources such as bulbs and _ _ _ _ _ _ _ _ _ _ _ _ _ _.

tubelights

Objects that emit light of their own are called _ _ _ _ _ _ _ _ _ _ _ _ _ _ objects.

luminous

Non-luminous objects become visible only when they _ _ _ _ _ _ _ _ _ _ _ _ _ _ light produced by a luminous object.

reflect

The temperature range at which an iron wire becomes luminous upon heating is between _ _ _ _ _ _ _ _ _ _ _ _ _ _ and _ _ _ _ _ _ _ _ _ _ _ _ _ _.

600° C; 800° C

The basic property of light travelling in a straight line is called _ _ _ _ _ _ _ _ _ _ _ _ _ _ propagation of light.

rectilinear

A pinhole camera is a simple device based on the principle of _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

rectilinear propagation of light

The image formed by a pinhole camera is always _ _ _ _ _ _ _ _ _ _ _ _ _ _ and inverted.

real

If the size of the pinhole is increased, the image formed will be _ _ _ _ _ _ _ _ _ _ _ _ _ _.

blurred

Objects that allow light to pass through them completely are called _ _ _ _ _ _ _ _ _ _ _ _ _ _ objects.

transparent

Spectacles and spherical lenses are examples of _ _ _ _ _ _ _ _ _ _ _ _ _ _ objects.

transparent

Only a part of the light passes through _ _ _ _ _ _ _ _ _ _ _ _ _ _ objects.

translucent

Frosted glass and butter paper are examples of _ _ _ _ _ _ _ _ _ _ _ _ _ _ objects.

translucent

Wood and metals are examples of _ _ _ _ _ _ _ _ _ _ _ _ _ _ objects.

opaque

A dark patch formed behind an opaque object when it blocks light is called a _ _ _ _ _ _ _ _ _ _ _ _ _ _.

shadow

The central darkest part of a shadow is called the _ _ _ _ _ _ _ _ _ _ _ _ _ _ region.

umbra

The _ _ _ _ _ _ _ _ _ _ _ _ _ _ is the region of partial darkness in a shadow.

penumbra

A shadow formed by a point source of light consists of only the _ _ _ _ _ _ _ _ _ _ _ _ _ _ region.

umbra

Longer shadows are formed in the _ _ _ _ _ _ _ _ _ _ _ _ _ _ and evening.

morning

An eclipse is commonly known as the formation of _ _ _ _ _ _ _ _ _ _ _ _ _ _ in nature.

shadows

A solar eclipse occurs when the _ _ _ _ _ _ _ _ _ _ _ _ _ _ lies between the Sun and the Earth.

Moon

A lunar eclipse occurs when the _ _ _ _ _ _ _ _ _ _ _ _ _ _ comes in between the Sun and the Moon.

Earth

A solar eclipse always occurs on a _ _ _ _ _ _ _ _ _ _ _ _ _ _ day.

new moon

During an annular solar eclipse, only the _ _ _ _ _ _ _ _ _ _ _ _ _ _ of the sun is visible as a bright ring.

rim

Pierre Janssen discovered the element _ _ _ _ _ _ _ _ _ _ _ _ _ _ during a total solar eclipse.

helium

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