मराठी

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 - Science

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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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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 5: Refraction of Light - Exercise 5 [पृष्ठ २५२]

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लखमीर सिंह Physics (Science) [English] Class 10
पाठ 5 Refraction of Light
Exercise 5 | Q 17 | पृष्ठ २५२

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संबंधित प्रश्‍न

A 4 cm tall object is placed on the principal axis of a convex lens. The distance of the object from the optical centre of the lens is 12 cm and its sharp image is formed at a distance of 24 cm from it on a screen on the other side of the lens. If the object is now moved a little away from the lens, in which way (towards the lens or away from the lens) will he have to move the screen to get a sharp image of the object on it again? How will the magnification of the image be affected?


What happens when a ray of light falls normally (or perpendiculary) on the surface of a plane mirror?

 


Write true or false 

A virtual image formed by a spherical mirror is always erect and situated behind the mirror.


A ray of light travels from a denser medium to a rarer medium. How will it bend?


The letters on the front of an ambulance are written laterally inverted like  . Give reason.


Name the two kinds of spherical mirrors and distinguish between them. 


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.


For what position of object, the image formed by a concave mirror is magnified and erect?


Name the kind of mirror used to obtain:

A real and diminished image. 


The focal length of a concave mirror is 10 cm. Find its radius of curvature. 


The sun is seen before the sunrise and after the sunset.


Define the following term in relation to concave mirror.

Focal length 


Complete the following diagrams shown in the below figure by drawing the reflected ray for each incident ray.


An object 10 cm high is placed at a distance of 20 cm in front of a spherical mirror of focal length 25 cm. By scale drawing find the nature, position, and magnification of the image in the following case:
Convex mirror


Complete the following diagrams shown in the following figures by drawing the reflected rays.


Geometric centre of the spherical mirror is ______.


If the real image of a candle flame formed by a lens is three times the size of the flame and the distance between lens and image is 80 cm, at what distance should the candle be placed from the lens?


Size of image of an object by a mirror having a focal length of 20 cm is observed to be reduced to 1/3rd of its size. At what distance the object has been placed from the mirror? What is the nature of the image and the mirror?


Define the radius of curvature.


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?


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