A substance which transmits most of the light rays incident on it is called
The distance between the sun and the earth is
Which of the following is a natural source of light
The earth light can be seen from
Earth is a non-luminous body and does not emit any light.
The speed of light is
The speed of light is
The speed of light decreases with an increase in the density of the medium.
Image formed by plane mirror is always
An image obtained on screen is
Which of the following letters will be seen without any change in a plane mirror?
T is a laterally symmetrical object and hence its image in a plane mirror would be the same as itself.
A source of light is
As the distance of source increases
The energy of the light keeps on getting absorbed and transformed as it moves through a medium. Therefore, its intensity decreases.
Which of the following statement is true?
A spherical mirror with its reflecting surface on the outside is a
Which of the following is luminous?
Objects that can emit light energy by themselves are known as luminous objects.
These objects can cause a sensation of light.
The luminous objects are visible as they emit light on their own.
Which of the following is transparent?
Which of the following is opaque?
Shadows are formed because
A magnifying glass is nothing but
A magnifying glass is a convex lens that is used to produce a magnified image of an object. The lens is usually mounted in a frame with a handle. A sheet magnifier consists of many very narrow concentric ring-shaped lenses, such that the combination acts as a single lens but is much thinner.
Following conditions are true for virtual image
a) The virtual image is always erect. The common example of virtual image is the image formed in the mirror when we stand in front of that mirror.
b) In reality, these rays come from the points on the mirror where they are reflected. The image behind the mirror is called a virtual image because it cannot be projected onto a screen—the rays only appear to originate from a common point behind the mirror.
c) Virtual images cannot be obtained on the screen because the image formed is from the light rays that do not meet but appear to meet when they are produced backwards.