Shadow formation is an example of :

Select the odd one out (shadows, eclipses, expansion, images)

Shadows, eclipses and images are formed due to the rectilinear propagation of light.

A pinhole camera can take pictures of moving objects.

Beam of light incident on a plane forms a real image of reflection. The incident beam is:

What kind of lens is used in making a pinhole camera ?

What is "Camera Obscura" effect ?

A ray of sunlight enters a spherical water droplet $(n = \dfrac{4}{3})$ at an angle of incidence $53^\circ$ measured with respect to the normal to the surface. It is reflected from the back surface of the droplet and re-enters into air. The angle between the incoming and outgoing ray is [Take $\sin \ 53^\circ = 0.8$]

A small plane mirror kept at the centre of a sphere of diameter $3\ m$, makes $12$ revolution per second. A thin light beam is made incident on the mirror. The linear speed of the light spot on the sphere, formed after reflection from the mirror is :

Intensity of light due to a point source at a distance $2m$ is $20$ units. The intensity due to the same source at a distance of $4m$ is

Light has a wave nature,because-

Which one statement is correct -

Light falls on a plane reflecting surface. For what angle of incidence is the reflected ray normal to the incident ray. 

Choose the correct option from the following 

$ Statement I:$ If the size of the hole in a pinhole camera is as big as the size of a green gram then the image becomes thick and the details of the image are not clearly seen. 

$Statement II:$ If the distance of the object from pinhole camera is increased then the size of the image that is observed on the screen also increases.

$Statement III :$ If the distance between screen and hole in the pinhole camera is increasing we observe the image is becoming blurred 

The speed of light in air is ___________ m/s.

The Image formed in a pinhole camera  is real. 

State the effect on the image formed by a pinhole camera if the size of the hole is increased.