Advertisements
Advertisements
प्रश्न
Where must the object be placed for the image formed by a converging lens to be:
real, inverted and same size as the object?
उत्तर
For a convex lens:
To form a real and inverted image, which is the same size as that of the object, the object should be at 2F.
APPEARS IN
संबंधित प्रश्न
A small bulb is placed at the focal point of a converging lens. When the bulb is switched on, the lens produces:
(a) a convergent beam of light
(b) a divergent beam of light
(c) a parallel beam of light
(d) a patch of coloured light
A ray of light is going towards the focus of a concave lens. draw a ray diagram to show the path of this ray of light after refraction through the lens.
When an object is placed 10 cm in front of lens A, the image is real, inverted, magnified and formed at a great distance. When the same object is placed 10 cm in front of lens B, the image formed is real, inverted and same size as the object.
What is the focal length of lens B?
Only one of the following applies to a concave lens. This is:
(a) focal length is positive
(b) image distance can be positive or negative
(c) height of image can be positive or negative
(d) image distance is always negative
State two applications of a concave lens.
How will you differentiate between a convex and a concave lens by looking at
- a distant object,
- a printed page?
Copy the following figure and complete it to show the formation of the image of the object AB. Name the lens used in the figure.
Define the principal focus of a concave lens.
If the power of a lens is -4.0 D, then it means that the lens is a ______.
Distinguish between Concave lens and Convex Lens.
