Advertisements
Advertisements
प्रश्न
Why are concave mirrors used in solar devices?
उत्तर
A concave mirror is also known as a converging mirror because of its ability to focus parallel rays of light at a single point on its focal plane. This property is used in solar devices. Parallel rays from the Sun, when reflected by the concave mirror, are focused at a particular point, generating a significant amount of heat. This heat is essential for the proper functioning of solar devices, such as solar cookers or solar furnaces.
APPEARS IN
संबंधित प्रश्न
Draw ray diagrams to show the principal focus of a convex mirror.
What is a spherical mirror? Distinguish between a concave mirror and a convex mirror.
Make labelled ray diagrams to illustrate the formation of:
a real image by a converging mirror.
Explain why, concave mirrors are used as shaving mirrors.
Draw ray-diagrams to show the formation of images when the object is places in front of a concave mirror (converging mirror):
(i) between its pole and focus
(ii) between its centre of curvature and focus
One of the following does not apply to a concave mirror this is:
(a) focal length is negative
(b) image distance can be positive or negative
(c) image distance is always positive
(d) height of image can be positive or negative
What is the position of the image when an object is placed at a distance of 20 cm from a concave mirror of focal length 20 cm?
An object is placed at a distance of 10 cm from a concave mirror of focal length 20 cm.
If an object of 10 cm height is placed at a distance of 36 cm from a concave mirror of focal length 12 cm, find the position, nature and height of the image.
A converging mirror forms a real image of height 4 cm of an object of height 1 cm placed 20 cm away from the mirror:
- Calculate the image distance.
- What is the focal length of the mirror?
Why does a beam of light when it enters glass at an angle? Why does it not bend if it inters the glass at right angles?
A convex mirror is used as a shaving mirror.
Draw a ray diagram to show the formation of image of an object placed at the centre of curvature of a concave mirror. State the position, size and nature of the image.
Draw a ray diagram to show the formation of image of an object placed between the pole and focus of a concave mirror. State the position, size and nature of the image.
To find the focal length of a concave mirror Rahul focuses a distant object with this mirror. The chosen object should be
(1) a tree
(2) a building
(3) a window
(4) the sun
The mirror used by the ophthalmologist to examine the eye is _______.
Large ______ mirrors are used to concentrate sunlight to produce heat in solar furnaces.
According to cartesion sign convention, which mirror and which lens has negative focal length?
Name the mirror(s) that can give (i) an erect and enlarged image, (ii) same sized, inverted image
Between which two points of a concave mirror should an object be placed to obtain a magnification of -2?
