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प्रश्न
An object is placed at a large distance in front of a concave mirror of radius of curvature 40 cm. The image will be formed in front of the mirror at a distance:
(a) 20 cm
(b) 30 cm
(c) 40 cm
(d) 50 cm
उत्तर
20 cm
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संबंधित प्रश्न
Three students A, B and C focussed a distant building on a screen with the help of a concave mirror. To determine focal length of the concave mirror they measured the distances as given below:
Student A : From mirror to the screen
Student B : From building to the screen
Student C : From building to the mirror
Who measured the focal length correctly ;
(a) Only A
(b) Only B
(c) A and B
(d) B and C
Find the focal length of a concave mirror whose radius of curvature is 32 cm.
Briefly describe how you would find the focal length of a concave mirror quickly but approximately
Explain why, concave mirrors are used as shaving mirrors.
If a concave mirror has a focal length of 10 cm, find the two positions where an object can be placed to give, in each case, an image twice the height of the object.
Draw and complete the following diagrams to show what happens to the beams of light as they enter the glass block and then leave it:
Which of the following can make a parallel beam of light when light from a point source is incident on it?
A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is ______.
______ mirrors magnify the object placed close to them.
To obtain an image twice the size of the object, between which two points related to a concave mirror should an object be placed?
