Advertisements
Advertisements
प्रश्न
Describe the positions of the source of light with respect to a concave mirror in Floodlight.
Advertisements
उत्तर
In a floodlight, the light source is slightly beyond the radius of curvature, which gives us the right light.
APPEARS IN
संबंधित प्रश्न
Draw ray diagrams to show the principal focus of a concave mirror.
Draw ray diagrams to show the principal focus of a convex mirror.
The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?
Which type of mirror is used by a dentist?
A ray of light is incident on a plane mirror making an angle of 90° with the mirror surface. The angle of reflection for this ray of light will be:
(a) 45°
(b) 90°
(c) 0°
(d) 60°
If the focal length of a convex mirror is 25 cm, what is its radius of curvature?
Fill in the following blank with suitable word:
Parallel rays of light are reflected by a concave mirror to a point called the ..........
ill in the following blank with suitable word:
For a convex mirror, parallel rays of light appear to diverge from a point called the ......... .
If an object is placed at the focus 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:
Explain why, a ray of light passing through the centre of curvature of a concave mirror gets reflected back along the same path.
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.
Which type of mirror is used in a solar furnace? Support your answer with reason.
In the concave reflector of a torch, the bulb is placed:
(a) between the pole and focus of reflector
(b) at the focus of reflector
(c) between focus and centre of curvature of reflector
(d) at the centre of curvature of reflector
Write down a formula for the magnification produced by a concave mirror.
in terms of height of object and height of image
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.
A bright object 50 mm high stands on the axis of a concave mirror of focal length 100 mm and at a distance of 300 mm from the concave mirror. How big will the image be?
What type of mirror should be used as a shaving mirror?
What would your image look like if you stood close to a large:
concave mirror?
An object is placed 15 cm from (a) a converging mirror, and (b) a diverging mirror, of radius of curvature 20 cm. Calculate the image position and magnification in each case.
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?
With the help of a labelled diagram, explain how a concave lens diverges a beam of parallel light rays. Mark the principal axis, optical centre, principal focus and focal length of the concave lens on the diagram.
In the following diagram. MM' is a concave mirror and AB is an object. Draw on your answer-sheet a ray diagram to show the formation of image of this object.
A student obtained a sharp image of the grills of a window on a screen using a concave mirror. His teacher remarked that for getting better results a well lit distant object (preferably the sun) should be focussed on the screen. What should be done for this purpose?
(A) Move the screen slightly away from the mirror
(B) Move the mirror slightly towards the screen
(C) Move the screen and the mirror away from the object
(D) Move the screen and the mirror towards the object
In which equipment/s do you find ___________________
List four characteristics of the image formed by a concave mirror of focal length 40 cm when the object is placed in front of it at a distance of 20 cm from its pole.
______ is used as reflectors in torchlight.
Large ______ mirrors are used to concentrate sunlight to produce heat in solar furnaces.
Name the mirror(s) that can give (i) an erect and enlarged image, (ii) same sized, inverted image
The mirror having reflecting surface curved inwards ______.
Examine the above figure and state which of the following option is correct? [one small box in the figure is equal to 1 cm]
You are provided with a convex mirror, a concave mirror, a convex lens and a concave lens. You can get an inverted image from
An image formed by a lens is erect. Such an image could be formed by a
State whether the following statement is True or False.
The sides of an object and its image formed by a concave mirror are always interchanged
In torches, searchlights, and headlights of vehicles, the bulb is placed ______ of the concave mirror.
A student wants to obtain an erect image of an object using a concave mirror of 10 cm focal length. What will be the distance of the object from mirror?
