Pin hole camera is based on the

• rectilinear propagation of light

• circular propagation of light

• rectangular propagation of light

• none of these

Shadow of an object is always

• colourful

• black

• transparent

• white

When we move an object away from the source of light, the shadow of the object

• becomes bigger

• remains the same

• becomes smaller

• none of these

When green light falls on a blue object, the colour of the shadow is

• green

• yellow

• blue

• black

Where would be a shady place to stand on a sunny day

• in middle of a ground

• under a tree

• in the sea

• all of these

Which of the features is not exhibited by a shadow of an object

• erect

• can be formed on screen

• same colour as the object

• can be bigger than object

A plane mirror form an image of an object because it ____ light from the object

• absorbs

• passes

• emits

• reflects

This is not a beam of light

• the headlight of a car

• light from firefly

• a torch shining

• projector onto a screen

When the left side of an object appears as the right side of the image and vice versa , this phenomenon is called

• lateral invasion

• lateral inversion

• literal invasion

• literal inversion

Which of these are required to form a shadow of a ball

• ball

• screen

• torch

• all of these