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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
Which type of mirror can form a real image?
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.
Write the mirror formula. Give the meaning of each symbol which occurs in it.
A concave lens produces an image 20 cm from the lens of an object placed 30 cm from the lens. The focal length of the lens is:
(a) 50 cm
(b) 40 cm
(c) 60 cm
(d) 30 cm
How is a spherical mirror used to converge a beam of light at a point? Name the type of mirror used.
How is the focal length of a spherical mirror related to its radius
The radius of curvature of a convex mirror is 40 cm. Find its focal length.
A concave mirror forms a virtual image of size twice that of the object placed at a distance 5 cm from it. Find:
- the focal length of the mirror
- position of image
Visit a nearby hospital. You can also visit the clinic of an ENT specialist, or a dentist. Request the doctor to show you the mirrors used for examining ear, nose, throat and teeth. Can you recognise the kind of mirror used in these instruments?
