Light

The natural source of light is the

• Sun

• Moon

• Star

• Candle

Check the objects which produce their own light.

• Sun

• Light

• Moon

• Firefly

Light travelling in a straight line is called

• ray

• beam

• rectilinear propagation of light

• tube

Does the pinhole camera produce an image or a shadow of an object?

• Straight line

• Shadow

• Image

• Ray

Shadow are formed when light falls on a/an ________ object.

• transparent

• luminous

• opaque

• shadow

A solar eclipse can occur only on a ______________ .

• half moon day

• no moon day

• full moon day

• new moon day

According to the National Maritime Museum in London, a lunar eclipse cannot last longer than

• 4 hours 30 mins

• 3 hours 40 mins

Select all the transparent objects.

• spectacles

• binoculars

• visor on a helmet

• water

Define cold sources of light.

• The sources of light which do not emit heat but only light.

• The sources of light which emit light when they are heated to a very high temperature.

______ is a form of energy which affects the eye so as to produce the sensation of vision.