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प्रश्न
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उत्तर
Focal length = 1/2 of radius of curvature
= 1/2 X 30 = 15cm.
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संबंधित प्रश्न
Fill in the blank
The image formed by a plane mirror is erect and _____
Draw a diagram to show the reflection of a light ray incident normally on a plane mirror.
Explain the following term :
Plane mirror
Draw diagram/diagrams to show them.
What is meant by lateral inversion of an image in a plane mirror? Explain it with the help of a ray diagram.
Two plane mirrors are placed making an angle θ° in between them. For an object placed in between the mirrors, if angle is gradually increased from 0° to 180°, how will the number of images change : increase, decrease or remain unchanged?
State two uses of a plane mirror.
Prove geometrically that when plane mirror turns through a certain angle, the reflected ray turns through twice the angle.
Draw a neat two ray diagram for the formation of images in two plane mirrors, when mirrors are at right angles to each other.
A boy stands 4 m away from the plane mirror. If the boy moves `1/2` m towards the mirror, what is now the distance between the boy and his image? Give a reason for your answer.
