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प्रश्न
Describe the positions of the source of light with respect to a concave mirror in Floodlight.
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उत्तर
In a floodlight, the light source is slightly beyond the radius of curvature, which gives us the right light.
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संबंधित प्रश्न
If the image formed by a mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it? Draw a ray diagram to justify your answer. Where and why do we generally use this type of mirror?
Draw ray diagrams to show the principal focus of a concave mirror.
List four specific characteristics of the images of the objects formed by convex mirrors.
To construct ray diagrams, two rays of light are generally so chosen that it is easy to determine their directions after reflection from a mirror. Choose two such rays and state the path/direction of these rays after reflection from a concave mirror. Use these two rays to find the position and nature of the image of an object placed at a distance of 8 cm from a concave mirror of focal length 12 cm.
A spherical mirror produces an image of magnification -1.0 on a screen placed at a distance of 30 cm from the pole of the mirror.
(i) Write the type of mirror in this case.
(ii) What is the focal length of the mirror ?
(iii) What is the nature of the image formed ?
(iv) Draw the ray diagram to show the image formation in this case.
A concave mirror produces three times magnified (enlarged) real image of object placed at 10 cm in front of it. Where is the image located?
An object 4 cm in height, is placed at 15 cm in front of a concave mirror of focal length 10 cm. At what distance from the mirror should a screen be placed to obtain a sharp image of the object. Calculate the height of the image.
To construct a ray diagram we use two rays which are so chosen that it is easy to know their directions after reflection from the mirror. List two such rays and state the path of these rays after reflection in case of concave mirrors. Use these two rays and draw ray diagram to locate the image of an object placed between pole and focus of a concave mirror.
A concave mirror produces three times magnified image on a screen. If the object is placed 20 cm in front of the mirror, how far is the screen from the object.
Which type of mirror is used by a dentist?
For a convex mirror, parallel rays of light appear to diverge from a point called the ______.
Define the principal focus of a concave mirror.
If an object is at infinity (very large distance) in front of a concave mirror, where is the image formed?
Copy this figure in your answer book and show the direction of the light ray after reflection:
Draw the following diagram in your answer book and show the formation of image with the help of suitable rays:
If an object is placed at a distance of 8 cm from a concave mirror of focal length 10 cm, discuss the nature of the image formed by drawing the ray diagram.
State where an object must be placed so that the image formed by a concave mirror is:
(b) at infinity.
(c) the same size as the object.
With the help of a labelled ray diagram, describe how a converging mirror can be used to give an enlarged upright image of an object.
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.
State two characteristics of the image formed.
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.
At what distance from a concave mirror focal length 10 cm should an object 2 cm long be placed in order to get an erect image 6 cm tall?
Which of the following are concave mirrors and which convex mirrors?
If the radius of curvature of a concave mirror is 20 cm, its focal length is:
A student determines the focal length of a device 'X' by focusing the image of a distant object on a screen placed 20 cm from the device on the same side as the object. The device 'X' is
(a) Concave lens of focal length 10 cm
(b) Convex lens of focal length 20 cm
(c) Concave mirror of focal length 10 cm
(d) Concave mirror of focal length 20 cm
______ is used as reflectors in torchlight.
Large ______ mirrors are used to concentrate sunlight to produce heat in solar furnaces.
Under which of the following conditions a concave mirror can form an image larger than the actual object?
Beams of light are incident through the holes A and B and emerge out of box through the holes C and D respectively as shown in the figure. Which of the following could be inside the box?
A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top.
For a real object, which of the following can produce a real image?
The image formed by concave mirror is real, inverted and of the same size as that of the object. The position of object should be ______.
You are provided with a convex mirror, a concave mirror, a convex lens and a concave lens. You can get an inverted image from
The concave reflecting surface of a torch got rusted. What effect would this have on the beam of light from the torch?
The focal length of a concave mirror is 5cm. Its radius of curvature is ______.
Define principal focus of the concave mirror.
Write the uses of the concave mirror.
Which type of mirror is used in the following?
Head lamps of a car
