Advertisements
Advertisements
प्रश्न
Name the two types of spherical mirrors. What type of mirror is represented by the:
front side of a shining steel spoon?
Advertisements
उत्तर
The types of spherical mirrors represented by the
front side of a shining steel spoon is concave mirror
APPEARS IN
संबंधित प्रश्न
A student used a device (X) to obtain/focus the image of a well illuminated distant building on a screen (S) as shown below in the diagram. Select the correct statement about the device (X).

Explain the following term related to spherical lenses:- optical centre
A concave mirror always forms a real image.
Give one use each of a concave and a convex mirror.
A ray of light is incident normally on a plane mirror. What will be the
angle of incidence?
When a spherical mirror is held towards the sun and its sharp image is formed on a piece of a carbon paper for some time, a hole is burnt in the carbon paper.
What is the advantage of using a carbon paper rather than a white paper?
A small object is placed 150 mm away from a diverging lens of focal length 100 mm.
(i) Copy the figure below and draw rays to show how an image is formed by the lens.
Figure
(ii) Calculate the distance of the image from the lens by using the lens formula.
The diverging lens in part (a) is replaced by a converging lens also of focal length 100 mm. The object remains in the same position and an image is formed by the converging lens. Compare two properties of this image with those of the image formed by the diverging lens in part (a).
A concave lens produces an image 20 cm from the lens of an object placed 30 cm from the lens. The focal length of the lens is:
(a) 50 cm
(b) 40 cm
(c) 60 cm
(d) 30 cm
Name the kind of mirror used to obtain
(a) a real and enlarged image
(b) a virtual and enlarged image
(c) a real and diminished image, and
(d) a virtual and diminished image.
The image formed by a convex mirror is
An object forms a virtual image which is 1/8th of the size of the object. If the object is placed at a distance of 40 cm from the convex mirror, calculate:
- the position of the image
- the focal length of the convex mirror.
Geometric centre of the spherical mirror is ______.
If the real image of a candle flame formed by a lens is three times the size of the flame and the distance between lens and image is 80 cm, at what distance should the candle be placed from the lens?
The distance from the center of curvature of the mirror to the pole is called the focal length of the mirror.
What is the focal length (f) of a mirror?
What is “aperture”?
