Advertisements
Advertisements
प्रश्न
State one practical use each of convex mirror, concave mirror, convex lens and concave lens.
उत्तर
- A convex lens is used as a magnifying glass.
- A concave mirror is used as a shaving mirror.
- A convex mirror is used as rear view mirror in vehicles.
- A concave lens is used for correcting myopia.
APPEARS IN
संबंधित 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?
Where must the object be placed for the image formed by a converging lens to be:
real, inverted and larger than the object?
If the image formed by a lens is always diminished and erect, what is the nature of the lens?
An object lies at a distance of 2f from a concave lens of focal length f. Draw a ray-diagram to illustrate the image formation.
An object is placed 10 cm from a lens of focal length 5 cm. Draw the ray diagrams to show the formation of image if the lens is diverging.
A person cannot see distant objects clearly. His vision can be corrected by using the spectacles containing:
(a) concave lenses
(b) plane lenses
(c) contact lenses
(d) convex lenses
A person finds difficulty in seeing nearby objects clearly. His vision can be corrected by using spectacles containing:
(a) converging lenses
(b) diverging lenses
(c) prismatic lenses
(d) chromatic lenses
A concave lens has a focal length 30 cm. Find the position and magnification (m) of the image for an object placed in front of it at distance 30 cm. State whether the image is real or virtual?
An object is placed at a distance of 60 cm from a concave lens of focal length 30 cm.
(i) Use the lens formula to find the distance of the image from the lens.
(ii) List four characteristics of the image (nature, position, size, erect/inverted) formed by the lens in this case.
(iii) Draw a ray diagram to justify your answer of the part (ii).
Define the principal focus of a concave lens.
