and
3 When light falls on an object it may
a Pass through it
May bounce back into the same medium
Be completely cut off after being absorbed by the object
All of these
4. The mirrors used as rear view mirror in cars and in car headlights are
Convex, concave
b. Convex, plane
Convex, convex
d. Concave, concave
5. A light ray gets refracted towards the normal when it passes from
a Denser to rarer medium
b. Water to air
Botha, and b.
d. None of these
6. Magnifying glass is a
Concavelens
b. Convex lens
Can be both
d. None of these
7. Leaves appear green because they
4 Reflect light of all the colours and absorb green light
Reflect only green light and absorb light of all the colours
Absorb light of all the colours
Reflect light of all the colours
In the blanks:
Answers
Answer:
Reflection
Reflections from flat surfaces are fairly easy to understand. A reflection appears to be the same distance from the "other side" of the mirror as the viewer's eyes are from the mirror. Also, when light is reflected from a mirror, it bounces off at the same angle in the opposite direction from which it hit. For example, if the light hits a flat or "plane mirror" at a 30-degree angle from the left, it will bounce off at a 30-degree angle to the right.
However, if the surface of the mirror is curved, the angles of reflection are different at different points on the surface. The most common curved surface used in optical devices is a spherical mirror. If the mirror is convex, or curved outward, it will reflect a wider area, in which images appear smaller and farther away than those from a flat mirror. These mirrors are often used for outside rearview mirrors on cars and for keeping large areas under surveillance in stores.
If the surface is concave, or curved inward, a group of light rays from a distant source is reflected back toward a single location known as the focal point. This generally produces a magnifying effect, such as that seen in a makeup mirror. The radius of curvature of a mirror determines its magnification factor and its focal length.
Answer:
all of these
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