Advertisements
Advertisements
प्रश्न
An object is placed at a distance 20cm from a convex lens of focal length 10cm. Find the image distance and nature of the image.
Advertisements
उत्तर
u = -20 cm
f = 10 cm
`1/"f"` = `1/"v"`- `1/"u"`
`1/"v"` = `1/"f"`+ `1/"u"`
`1/"v"`= `1/10`+`1/"(-120)"`
`1/"v"`=`1/10`- `1/20`
v = `1/20` ⇒ v = 20 cm
Nature of the image real enlarged and inverted image.
APPEARS IN
संबंधित प्रश्न
A lens forms an upright and diminished image of an object when the object is placed at its focal point. Name the lens and draw a ray diagram to show the image formation.
Draw a ray diagram to show how a converging lens can form an image of the sun. Hence give a reason for the term ‘burning glass’ for a converging lens used in this manner.
A lens forms an inverted image of an object. What is the nature of the image real or virtual?
An object is placed at a distance of more than 40 cm from a convex lens of focal length 20 cm. The image formed is real, inverted and ______.
An object is placed at a distance 2f from a convex lens of focal length f. The size of the image formed is ______ that of the object.
An object is placed at a distance 5 cm from a convex lens of focal length 10 cm. The image formed is virtual, upright and _____.
For the object placed between the optical centre and focus of a convex lens, the image is ______.
Which of the following lens would you prefer to use while reading small letters found in a dictionary?
Sudha finds out that the sharp image of the window pane of her science laboratory is formed at a distance of 15 cm from the lens. She now tries to focus the building visible to her outside the window instead of the window pane without disturbing the lens. In which direction will she move the screen to obtain a sharp image of the building? What is the approximate focal length of this lens?
Complete the following table based on image formation by convex lens:
| Position of Object | Position of Image | Nature of Image |
| At infinity | (a) ______ | Real and inverted and highly diminished image |
| Beyond 2F1 | (b) ______ | (c) ______ |
| At 2F1 | (d) ______ | Real, inverted, same size (as object) image |
| Between F1 and 2F1 | Beyond 2F2 | (e) ______ |
| At focus F1 | (f) ______ | Real, inverted and highly enlarged image |
