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प्रश्न
उत्तर
Focal length = 1/2 of radius of curvature
= 1/2 X 30 = 15cm.
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संबंधित प्रश्न
Draw a diagram to show the reflection of a light ray incident normally on a plane mirror.
Write three characteristics of the image formed by a plane mirror?
The image formed by a plane mirror is :
An insect is sitting in front of a plane mirror at a distance 1 m from it.
(a) Where is the image of the insect formed?
Two plane mirrors are placed making an angle θ in between them. Write an expression for the number of images formed of an object placed in between the mirrors. State the condition, if any.
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.
State the mirror formula for the formation of total number of images formed in two plane mirrors, held at an angle.
Parallel rays are incident:
- on regular surface and
- on irregular surface. In what respect do reflected rays in (1) differ from those of (2)?
