148 questions · auto-graded multiple-choice test.
The shadow cast by a pole under the sun will be the shortest at $12$ noon.
Student $D$ will be able to see the candle flame clearly because light travels along a straight line. However, students $A, B$ and $C$ will not be able to see the flame clearly because the tubes are not straight.
A shoe box can never form a circular shadow because in. any condition it does not have a circular shape. However, a ball, a flat disc and the base of ice-cream cone can form a circular shadow.
The length of the shadow changes according to the position of the source of light, i.e., the sun with respect to the object.
Here, are all the statements are incorrect. Hence, your answer will be option $[C]. [A]$ The pinhole camera works on the principle that light travels in straight lines. $[B]$ An inverted image is formed in a pinhole camera very simply. $[D]$ The pinhole camera is a simple device to see the images of various objects.
Figure $(iii)$ is periscope which is used to see around the corners. It is based upon the principle of rectilinear propagation of light and reflection of light.
The materials like butter paper, oil paper, tissue paper, sheet of white cotton, frosted glass, muddy water and clouds are translucent materials. They allow only a part of the light falling on their surface to pass through them. As we cannot see clearly through a translucent material.
To see the entire length of your body reflected in the mirror, you should use a mirror whose height will allow you to see your full image.
$(i)$ Umbra $(ii)$ Darkness $(iii)$ Brightness $(iv)$ Penumbra.
Fluorescent tube is an artificial light source.
Since the position of the sun changes during the day, the size and shape of the shadow of the tree change. At $8:00\ am$ and $3:00\ pm,$ the lengths of the shadows of the tree will be longer than its actual length and is pointed towards West and the East directions, respectively. However, at $12:00$ noon, the sun will be just above the tree, so the shadow of the tree will be short.
Both the size and shape of the shadow of the tree will be changed because at $8\ a.m.$ and $3\ p.m.,$ the length of the shadows of free will be longer than its actual length and point to the west and the east directions, respectively. However, at $12$ noon, the sun will be high in the sky just above the tree, so the shadow of tree will be shot.
Shadow formed is larger in the morning and evening as compare to the shadow at noon because at noon the sun is at top of the stick.
Moon is non-luminous. It becomes visible when light from sun falls on it.
$I, O, U$ will not show lateral inversion.
Both the size and shape of the shadow of the tree will be changed because at $8:00\ am$ and $3:00\ pm,$ the lengths of the shadows of tree will be longer than its actual length and point to the West and the East directions, respectively. However, at $12:00$ noon, the sun will be high in the sky just above the tree, so the shadow of tree will be short.
As $u = – R;$
$\therefore$ $\frac{1}{v}-\frac{u}{-R}=\frac{1-u}{(-R)}$
$\Rightarrow u= – R$