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प्रश्न
A student has to determine the focal length of a concave mirror by obtaining the image of a distant object on a screen. For getting best result he should focus
(A) a distant tree or an electric pole
(B) a well-illuminated distant building
(C) well-lit grills of the nearest window
(D) a burning candle laced at the distant edge of the laboratory table
उत्तर
In order to determine the focal length of a concave mirror, the student should focus on a distant tree or an electric pole.
The Correct Answer is A
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संबंधित प्रश्न
Draw ray diagrams to show the principal focus of a concave mirror.
Name the type of mirror used in the following situation:
Headlights of a car
Support your answer with reason.
Find the focal length of a concave mirror whose radius of curvature is 32 cm.
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.
Give any two applications of a concave and convex mirror.
According to cartesion sign convention, which mirror and which lens has negative focal length?
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 ______.
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?
In the headlights of motor vehicles, ______ mirrors are used as reflectors.
Which type of mirror is used in the following?
Floodlights
