Advertisements
Advertisements
Question
An object 10 cm high is placed at a distance of 20 cm in front of a spherical mirror of focal length 25 cm. By scale drawing find the nature, position, and magnification of the image in the following case:
Convex mirror
Advertisements
Solution
Focal length =25 cm.
Object distance = 20 cm.
Height o f object = 10 cm.
The image is virtual, erect, and diminished.
APPEARS IN
RELATED QUESTIONS
Explain the following term related to spherical lenses:- aperture
A concave mirror always forms a real image.
What is the name of the phenomenon in which the right side of an object appears to be the left side of the image in a plane mirror?
Name the spherical mirror which can produce a real and diminished image of an object.
What do you understand by the focus and focal length of a spherical mirror? Show them on the separate diagrams for each of a concave mirror and a convex mirror.
In each case (a) and (b), draw reflected rays for the given incident rays and mark focus by the symbol F.
When an object of height 1 cm is kept at a distance 4 cm from a concave mirror, its erect image of height 1.5 cm is formed at a distance 6 cm behind the mirror. Find the focal length of mirror, by drawing.
Assertion: Incident ray is directed towards the centre of curvature of spherical mirror. After reflection it retraces its path.
Reason: Angle of incidence (i) = Angle of reflection (r) = 0°
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?
A converging lens of focal length f is placed at a distance 0.3 m from an object to produce an image on a screen 0.9 m from the lens. With the object and the screen in the same positions, an image of the object could also be produced on the screen by placing a converging lens of focal length.
