English

A Small Object is Placed 150 Mm Away from a Diverging Lens of Focal Length 100 Mm. (I) Copy the Figure Below and Draw Rays to Show How an Image is Formed by the Lens. Figure (Ii) Calculate the Distance of the Image from the Lens by Using the Lens Formula. - Science

Advertisements
Advertisements

Question

A small object is placed 150 mm away from a diverging lens of focal length 100 mm.
(i) Copy the figure below and draw rays to show how an image is formed by the lens.
Figure
(ii) Calculate the distance of the image from the lens by using the lens formula.

Advertisements

Solution

The image formed by the lens is virtual, erect and diminished in size. 

 

(a)(ii) Object distance (u) = -150 mm = -15 cm (sign convention)
          Focal length (f) = -100 mm = -10 cm (sign convention)
         Image distance (v) = ?  

  Applying the lens formula, we have: 

`1/v-1/u=1/f` 

`1/v-1/-15=1/-10` 

`1/v+1/15=-1/10` 

`1/v=1/10-1/15` 

`1/v=(-3-2)/30` 

`1/v=(-5)/30` 

`v=-6 cm `

shaalaa.com
  Is there an error in this question or solution?
Chapter 5: Refraction of Light - Exercise 6 [Page 256]

APPEARS IN

Lakhmir Singh Physics (Science) [English] Class 10
Chapter 5 Refraction of Light
Exercise 6 | Q 13.1 | Page 256

Video TutorialsVIEW ALL [1]

RELATED QUESTIONS

A student obtains a sharp image of the distant window (W) of the school laboratory on the screen (S) using the given concave mirror (M) to determine its focal length. Which of the following distances should he measure to get the focal length of the mirror?


Explain the following term related to spherical lenses: focal length


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. 


How is a spherical mirror used to diverge a beam of light from a point? Name the type of mirror used.


Draw a ray diagram to show the formation of image by a concave mirror for an object placed between its pole and focus. State three characteristics of the image.


 Write two more characteristics of the image. 


Why does a driver use a convex mirror instead of a plane mirror as a rear view mirror?
Illustrate your answer with the help of a ray diagram.


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


Define the following term in relation to concave mirror.

Principal axis


Mention one main application of convex mirrors.

What do you mean by the magnification produced by mirrors?

What is the nature of a mirror having a focal length of +15 cm?

What kind of mirror is used in vehicles to see the traffic on the rear side?

Name the spherical mirror which can produce a real and diminished image of an object.

What do you mean by the principal axis?

Find the height of the image of a body of height 1.5m in a mirror with a magnification of 1.5.


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?


A ray of light is incident towards a plane mirror at an angle of 30° with the mirror surface. What will be the angle of reflection?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×