ncert class 7th science chapter 11 important questions answers

Concave lens
Concave mirror
Convex lens
Convex mirror
Erect image
Magnified image
Magnifying glass
Prism
Rainbow
Real image
Rear view mirror
Side mirror
Spherical mirror
Virtual image

Light travels along straight lines.
 Any polished or a shining surface acts as a mirror.
 An image which can be obtained on a screen is called a real image.
 An image which cannot be obtained on a screen is called a virtual image.
 The image formed by a plane mirror is erect. It is virtual and is of the
same size as the object. The image is at the same distance behind the
mirror as the object is in front of it.
 In an image formed by a mirror, the left side of the object is seen on the
right side in the image, and right side of the object appears to be on the
left side in the image.
 A concave mirror can form a real and inverted image. When the object is
placed very close to the mirror, the image formed is virtual, erect and
magnified.
 Image formed by a convex mirror is erect, virtual and smaller in size
than the object.
 A convex lens can form real and inverted image. When the object is
placed very close to the lens, the image formed is virtual, erect and
magnified. When used to see objects magnified, the convex lens is called
a magnifying glass.
 A concave lens always forms erect, virtual and smaller image than the
object.
 White light is composed of seven colours.

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