Explanation: The power of a convex lens is positive. Hence, focal length of convex lens is also positive. The required Option (a) “A convex lens has 4 dioptre power
having a focal length 0.25 m
” is correct.
Which of the following statements is true AA convex lens has 4 dioptre power having a focal length 0.25 MB a convex lens has 4 dioptre power having a focal length 0.25 Mc a concave lens has 4 dioptre power?
a)A convex lens has 4 dioptre power having a focal length 0.25 mb)A convex lens has -4 dioptre power having a focal length 0.25 mc)A concave lens has 4 dioptre power having a focal length 0.25 md)A concave lens has – 4 dioptre having a focal 0.25 mCorrect answer is option ‘
A
‘.
Which of the following statements is are true * A A convex lens has 4 dioptre power having a focal length 0.25 m/b a convex lens has 4 dioptre power having a focal length 0.25 m/c a concave lens has?
The required option a. “A convex lens has 4 dipotre power having a focal length 0.25m” is correct.
What are 4 different applications of concave lenses?
- Concave Lens Uses. SpectaclesLasersCamerasFlashlightsPeepholes. …
- Concave lens used in glasses. …
- Uses of concave lens in lasers. …
- Use of concave lens in cameras. …
- Used in flashlights. …
- Concave lens used in peepholes.
What is the power of concave lens of focal length 0.25 m?
A concave lens has
4 dioptre
power having a focal length 0.25 m.
Which of the following statement is true 1 a convex lens has 4 diopters?
The required Option (a) “A convex lens has 4 dioptre power
having a focal length 0.25 m
” is correct. Explanation: The power of a convex lens is positive. Hence, focal length of convex lens is also positive.
Which statement is true of a convex lens?
A
convex lens has to converge the rays coming towards it at a single point
. For that to be possible, the lens has to be thin at the edges for the bending of light to be smaller and must be thick at the center of the bending of light to be larger there.
What is the magnifying power of a concave lens?
From the formula, it is clear that the magnification varies directly with the size of the image. The image formed by a concave mirror is always smaller than the size of the object. Therefore, the magnification of a concave mirror is
always less than 1
.
What images are formed by convex lenses?
A convex lens forms
a virtual image
when the object is kept between the lens and its focus but the image formed is an enlarged one. A convex lens acts as a magnifying lens. Therefore we can rule out option (B).
What is the focal length of lens of power 5d?
Find its focal length. As we know, the power of the lens is the reciprocal of its focal length. Hence, the focal length is
20 cm
.
What are examples of concave lenses?
Some examples are
binoculars, telescopes, eyeglasses, cameras, flashlights and lasers
.
Where is concave lens used?
A concave lens is used
to diverge incident rays
. This helps to create a virtual image on the opposite side of the refracting surface. Hence, these lenses are used in binoculars, telescopes, cameras, flashlights and eyeglasses.
What are the five uses of convex lens?
- A convex lens is employed in microscopes and magnifying glasses to converge all incoming light rays to a particular point. …
- The convex lens is used in cameras. …
- A convex lens is used for the correction of hyperopia. …
- The converging lens is used in the projector as well.
What is the focal length of a lens of power 1d?
One dioptre is the power of the lens whose focal length is
1m
.
What is the magnification produced by a convex mirror?
As the object will get closer to the mirror the image will get bigger and bigger but it will not get bigger than the original object. So, the image formed in a convex mirror is always virtual and diminished. So, the magnification of a convex mirror is
always less than 1
.
Which of the following can make a parallel beam of light when light from a point source is incident?
Question. 1 Which of the following can make a parallel beam of light when light from a point source is incident on it? Explanation: When a point light source is placed at the
focus of concave mirror
then it all light rays after reflection through mirror will become parallel to the principal axis.
