What is an image? Explain its types.
(N/A) An image is an optical representation of an object formed when light rays originating from a point source meet or appear to meet after reflection or refraction.
There are two types of images:
$1$. Real Image: $A$ real image is formed when light rays actually converge at a point after reflection or refraction. It can be obtained on a screen and is always inverted.
$2$. Virtual Image: $A$ virtual image is formed when light rays do not actually meet but appear to diverge from a point when produced backwards. It cannot be obtained on a screen and is always erect.
There are two types of images:
$1$. Real Image: $A$ real image is formed when light rays actually converge at a point after reflection or refraction. It can be obtained on a screen and is always inverted.
$2$. Virtual Image: $A$ virtual image is formed when light rays do not actually meet but appear to diverge from a point when produced backwards. It cannot be obtained on a screen and is always erect.
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As shown in the figure, a parallel beam of light is incident on the upper part of a prism of angle $1.8^{\circ}$ and material of refractive index $1.5$. The light emerging from the prism falls on a concave mirror of radius of curvature $40 \,cm$. The distance of the point from the principal axis of the mirror where the light rays are focused after reflection from the mirror is:
The camera lens has an aperture of $f$ and the exposure time is $(1/60) \, s$. What will be the new exposure time if the aperture becomes $1.4 \, f$?
MediumAIIMS 2007
View SolutionAssertion : $A$ concave mirror and convex lens both have the same focal length in air. When they are submerged in water,they will have same focal length.
Reason : The refractive index of water is smaller than the refractive index of air.
Reason : The refractive index of water is smaller than the refractive index of air.
$A$ ray of light strikes a plane mirror $M$ at an angle of $45^{\circ}$ as shown in the figure. After reflection,the ray passes through a prism of refractive index $1.5$ whose apex angle is $4^{\circ}$. The total angle through which the ray is deviated is......$^{\circ}$
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View SolutionWhen sunlight falls normally on Earth,a luminous flux density (illuminance) of $1.57 \times 10^5 \; lm/m^2$ is produced on Earth. If the distance of Earth from the Sun is $1.5 \times 10^8 \; km$,what is the total luminous flux emitted by the Sun?
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