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प्रश्न
Answer the following question.
Write the modification in the curvature of the eye lens which enables us to see the nearby objects clearly?
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उत्तर
There should be a contract in ciliary muscles, that will increase the curvature of the eye lens and becomes thicker consequently the focal length of the eye lens will decrease. It will enable us to see near objects clearly.
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संबंधित प्रश्न
What is the relation between the focal length and radius of curvature of a spherical mirror (concave mirror of convex mirror)? Calculate the focal length of a spherical mirror whose radius of curvature is 25 cm.
When a spherical mirror is held towards the sun and its sharp image is formed on a piece of a carbon paper for some time, a hole is burnt in the carbon paper.
Why is a hole burnt in the carbon paper?
Write the formula for a lens connecting image distance (v), object distance (u) and the focal length (f). How does the lens formula differ from the mirror formula?
A diverging lens is used in:
(a) a magnifying glass
(b) a car to see objects on rear side
(c) spectacles for the correction of short sight
(d) a simple camera
Figure shows a concave mirror with its pole at P, focus F and centre of curvature C. Draw ray diagram to show the formation of image of an object OA.
Discuss the position and nature of image formed by a concave mirror when an object is moved from infinity towards the pole of mirror.
A concave mirror forms a virtual image of size twice that of the object placed at a distance 5 cm from it.
Find : (a) the focal length of the mirror (b) position of image
A concave mirror can be used to produce a parallel beam of light. Draw a ray to illustrate this.
Name the type of mirror used in the following situation:
Solar furnace
Support your answer with reason.
The distance from the center of curvature of the mirror to the pole is called the focal length of the mirror.
