Advertisements
Advertisements
प्रश्न
Describe the nature of image formed when an object is placed at a distance of 30 cm from a convex lens of focal length 15 cm.
उत्तर
Given:
u = -30 cm
(Since the object is placed on the left side of lens)
Focal length f = +15 cm
According to lens formula:
`1/v-1/u=1/f`
or `1/v=1/f+1/u`
=`1/15+(-1/30)`
or v=30 cm
Thus, the image is formed at a distance of 30 cm from the convex lens. The plus sign for image distance shows that the image is formed on the right side of the convex lens. Only real and inverted image is formed on the right side of a convex lens; therefore, the image is real and inverted.
APPEARS IN
संबंधित प्रश्न
A ray of light travelling in water emerges into air. Draw a ray-diagram indicating the change in its path.
Name one simple optical instrument in which the above arrangement of convex lens is used.
If the object is moved to a point only 3 cm away from the lens, what is the new position, height and nature of the image?
The diagram alongside shows the refraction of a ray of light from sir to a liquid.
(a) write the values of (i) angle of incidence, (ii) angle of refraction.
(b) use snell’s law to find the refractive index of liquid with respect to air.
Study the diagram given below.
- Name the lens LL’.
- What are the points O and O’ called?
- Complete the diagram to form the image of the object AB.
- State the three characteristics of the image.
- Name a device in which this action of lens is used.
Where is the image formed?
The given below figure shows an object OA and its image IB formed by a lens.
The given below figure shows an object OA and its image IB formed by a lens. State three characteristics of the image.
A lens forms an upright and magnified image of an object State whether the image is real or virtual
Out of the two lenses one concave and the other convex state which is a convergent or a divergent type of a lens. Give a reason for your answer.
