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प्रश्न
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
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उत्तर
Spectacles for the correction of short sight
A diverging lens is used in spectacles to correct short-sightedness.
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संबंधित प्रश्न
A student focused the Sun rays using an optical device 'X' on a screen S as shown.
From this it may be concluded that the device 'X' is a (select the correct option)
(A) Convex lens of focal length 10 cm.
(B) Convex lens of radius of curvature 20 cm.
(C) Convex lens of focal length 20 cm.
(D) Concave mirror of focal length 20 cm.
A ray of light is incident normally on a plane mirror. What will be the
angle of incidence?
Complete the following sentence:
All the distances are measured from the .......... of a spherical mirror.
Write the mirror formula. Give the meaning of each symbol which occurs in it.
How is a spherical mirror used to converge a beam of light at a point? Name the type of mirror used.
Explain the following term:
Incident ray
Draw diagram/diagrams to show them.
Name the spherical mirror which (i) diverges (ii) converges the beam of light incident on it. Justify your answer by drawing a ray diagram in each case.
Define the terms focus and focal length of a concave mirror. Draw diagram to illustrate your answer.
Name the mirrors shown in Figure (a) and (b).
State the two convenient rays that are chosen to construct the image by a spherical mirror for a given object? Explain your answer with the help of suitable ray diagrams.
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.
Draw a ray diagram to show the formation of image by a concave mirror for the object beyond its centre of curvature. State three characteristics of the image.
Name the kind of mirror used to obtain :
A real and enlarged image
The erect image formed by a concave mirror is of size double the size of object. How are u and v related?
Select the correct option:
Which mirror is used in periscope?
Define the following term in relation to concave mirror.
Principal axis
Define the term Principle focus.
Numerical problem.
The radius of curvature of a spherical mirror is 25 cm. Find its focal length.
A converging lens of focal length f is placed at a distance 0.3 m from an object to produce an image on a screen 0.9 m from the lens. With the object and the screen in the same positions, an image of the object could also be produced on the screen by placing a converging lens of focal length.
