Light shadows and reflections

Which of the following iis not necessary to observe a shadow

• Sun

• Screen

• Source of light

• Opaque object

Which of the following can never form a circular shadow

• A ball

• A flat disc

• A shoe box

When an opaque object comes in path of light it forms

• An image

• A shadow

Which of the following is bioluminescence

• Firefly

• The sun

• Moon

• Bulb

A torch bulb is a luminous object

• True

• False

Light travels in a straight line

How much time does the sunlight take to reach the earth

• 3 minutes

• 6 minutes 4 seconds

• 8 minutes 20 seconds

What is lateral inversion

• Image becomes inverted

• Right of the object becomes left of the object

• Image bends laterally

• All of these happen

Which letters in English alphabet won't show lateral inversion

• A,F,S

• I,O,U

• N,T,P

What makes things visible to us

• Shadow

• Light

• Reflection